money_game

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Intro to Programming Languages

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Commands

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Command Arguments

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Command History

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The Root Path

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Absolute Paths

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Changing position

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Changing to an Absolute Path

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Relative Paths

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Cat

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Ls

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Ls All

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Find

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Piping Echo

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Piping Stdout

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Piping Stdin

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Start Here

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Using the Terminal

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Using the VSCode Workspace

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Using the GUI Desktop

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Pasting into the Desktop

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Restarting Challenges

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Challenge Programs

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The Flag File

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Using Privileged Mode

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Persistent Home Directories - One

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Persistent Home Directories - Two

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Linux Luminarium

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Intro to Commands

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Intro to Arguments

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Command History

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The Root

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Program and absolute paths

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Position thy self

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Position elsewhere

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implicit relative paths, from /

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explicit relative paths, from /

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implicit relative path

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home sweet home

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cat: not the pet, but the command!

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catting absolute paths

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more catting practice

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grepping for a needle in a haystack

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comparing files

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listing files

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touching files

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removing files

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moving files

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copying files

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hidden files

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An Epic Filesystem Quest

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making directories

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finding files

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linking files

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Learning From Documentation

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Learning Complex Usage

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Reading Manuals

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Searching Manuals

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Searching For Manuals

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Helpful Programs

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Help for Builtins

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Matching with *

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Matching with ?

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Matching with []

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Matching paths with []

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Multiple globs

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Mixing globs

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Exclusionary globbing

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Tab completion

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Multiple options for tab completion

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Tab completion on commands

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Redirecting output

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Redirecting more output

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Appending output

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Redirecting errors

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Redirecting input

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Grepping stored results

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Grepping live output

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Grepping errors

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Filtering with grep -v

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Filtering with sed

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Duplicating piped data with tee

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Process substitution for input

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Writing to multiple programs

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Split-piping stderr and stdout

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Named pipes

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Printing Variables

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Setting Variables

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Multi-word Variables

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Exporting Variables

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Printing Exported Variables

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Storing Command Output

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Reading Input

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Reading Files

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Translating characters

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Deleting characters

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Deleting newlines

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Extracting the first lines with head

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Extracting specific sections of text

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Sorting data

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Listing Processes

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Killing Processes

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Interrupting Processes

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Killing Misbehaving Processes

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Suspending Processes

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Resuming Processes

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Backgrounding Processes

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Foregrounding Processes

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Starting Backgrounded Processes

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Process Exit Codes

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Becoming root with su

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Other users with su

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Cracking passwords

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Using sudo

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Changing File Ownership

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Groups and Files

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Fun With Groups Names

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Changing Permissions

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Executable Files

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Permission Tweaking Practice

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Permissions Setting Practice

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The SUID Bit

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Chaining with Semicolons

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Building on Success

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Handling Failure

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Your First Shell Script

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Redirecting Script Output

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Executable Shell Scripts

Time of First Successful Submission: 2026-04-06 14:57:38

Understanding Shebangs

Time of First Successful Submission: 2026-04-06 15:03:27

Scripting with Arguments

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Scripting with Conditionals

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Scripting with Default Cases

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Scripting with Multiple Conditions

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Reading Shell Scripts

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Launching Screen

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Detaching and Attaching

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Finding Sessions

Time of First Successful Submission: 2026-04-07 02:20:24

Switching Windows

Time of First Successful Submission: 2026-04-07 02:22:40

Detaching and Attaching (tmux)

Time of First Successful Submission: 2026-04-06 16:59:25

Switching Windows (tmux)

Time of First Successful Submission: 2026-04-07 03:32:13

The PATH Variable

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Setting PATH

Time of First Successful Submission: 2026-04-06 16:22:52

Finding Commands

Time of First Successful Submission: 2026-04-06 16:24:19

Adding Commands

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Hijacking Commands

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Bashrc Backdoor

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Sniffing Input

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Overshared Directories

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Tricky Linking

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Sniffing Process Arguments

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Snooping on Configurations

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The Fork Bomb

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Disk-Space Doomsday

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rm -rf /

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Life after rm -rf /

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Finding meaning after rm -rf /

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Computing 101

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Your First Register

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Your First Syscall

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Exit Codes

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Building Executables

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Moving Between Registers

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Loading From Memory

Time of First Successful Submission: 2026-04-09 02:32:05

More Loading Practice

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Dereferencing Pointers

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Dereferencing Yourself

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Dereferencing with Offsets

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Stored Addresses

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Double Dereference

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The Stack

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Stack Offsets

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Program Arguments on the Stack

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Popping From the Stack

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Disassembling Programs

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Tracing Syscalls

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Starting GDB

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Quitting GDB

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Starting Programs in GDB

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Disassembling in GDB

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Stepping Through Instructions

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Reading Register Values

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Popping Stack Values

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Examining Memory

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Examining Stack Pointers

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Cooperative Debugging

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Writing Output

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Chaining Syscalls

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Writing Strings

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Reading Data

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Opening Files

Time of First Successful Submission: 2026-04-09 09:50:33

Hardcoding the Filename

Time of First Successful Submission: 2026-04-09 09:59:04

Comparing Values

Time of First Successful Submission: 2026-04-09 12:13:35

Comparing Characters

Time of First Successful Submission: 2026-04-09 12:20:15

Conditional Control Flow

Time of First Successful Submission: 2026-04-09 12:29:58

Comparing Strings

Time of First Successful Submission: 2026-04-09 15:41:30

Reverse the Password

Time of First Successful Submission: 2026-04-09 15:46:39

Conditionals Without Conditionals

Time of First Successful Submission: 2026-04-09 17:03:44

Looping

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Reverse the Calculation

Time of First Successful Submission: 2026-04-09 17:12:11

Reverse the Reverse

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Dealing with Bitwise Operations

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Loops on Data

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set-register

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set-multiple-registers

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add-to-register

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linear-equation-registers

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integer-division

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modulo-operation

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set-upper-byte

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efficient-modulo

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byte-extraction

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bitwise-and

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check-even

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memory-read

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memory-write

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memory-increment

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byte-access

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memory-size-access

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little-endian-write

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memory-sum

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stack-subtraction

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swap-stack-values

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average-stack-values

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absolute-jump

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relative-jump

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jump-trampoline

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conditional-jump

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indirect-jump

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average-loop

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count-non-zero

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string-lower

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most-common-byte

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Exit

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Socket

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Bind

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Listen

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Accept

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Static Response

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Dynamic Response

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Iterative GET Server

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Concurrent GET Server

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Concurrent POST Server

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Web Server

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Debugging Programs

Time of First Successful Submission: 2026-04-13 17:32:46

Inspecting Registers

Time of First Successful Submission: 2026-04-13 17:37:58

Examining Memory

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Setting Breakpoints

Time of First Successful Submission: 2026-04-14 02:12:39

GDB Scripting

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Modifying Data

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Modifying Execution

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Broken Functions

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Playing With Programs

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What's the password?

Time of First Successful Submission: 2026-04-14 07:46:53

... and again!

Time of First Successful Submission: 2026-04-14 07:58:57

Newline Troubles

Time of First Successful Submission: 2026-04-14 08:27:34

Reasoning about files

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Specifying Filenames

Time of First Successful Submission: 2026-04-14 08:42:21

Binary and Hex Encoding

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More Hex

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Decoding Hex

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Decoding Practice

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Encoding Practice

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Hex-encoding ASCII

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Nested Encoding

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Hex-encoding UTF-8

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UTF Mixups

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Modifying Encoded Data

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Decoding Base64

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Encoding Base64

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Dealing with Obfuscation

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Dealing with Obfuscation 2

Time of First Successful Submission: 2026-04-14 12:45:39

Your First HTTP Request

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Reading Flask

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Commented Data

Time of First Successful Submission: 2026-04-14 14:01:23

HTTP Metadata

Time of First Successful Submission: 2026-04-16 12:53:09

HTTP (netcat)

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HTTP Paths (netcat)

Time of First Successful Submission: 2026-04-16 16:51:25

HTTP (curl)

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HTTP (python)

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HTTP Host Header (python)

Time of First Successful Submission: 2026-04-16 17:35:37

HTTP Host Header (curl)

Time of First Successful Submission: 2026-04-17 03:55:15

HTTP Host Header (netcat)

Time of First Successful Submission: 2026-04-17 03:58:11

URL Encoding (netcat)

Time of First Successful Submission: 2026-04-19 03:57:59

HTTP GET Parameters

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Multiple HTTP Parameters (netcat)

Time of First Successful Submission: 2026-04-19 04:03:00

Multiple HTTP Parameters (curl)

Time of First Successful Submission: 2026-04-19 05:32:57

HTTP Forms

Time of First Successful Submission: 2026-04-19 05:37:27

HTTP Forms (curl)

Time of First Successful Submission: 2026-04-19 05:39:04

HTTP Forms (netcat)

Time of First Successful Submission: 2026-04-19 05:42:27

HTTP Forms (python)

Time of First Successful Submission: 2026-04-19 05:43:41

HTTP Forms Without Forms

Time of First Successful Submission: 2026-04-19 05:45:13

Multiple Form Fields (curl)

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Multiple Form Fields (netcat)

Time of First Successful Submission: 2026-04-19 05:47:58

HTTP Redirects (netcat)

Time of First Successful Submission: 2026-04-19 05:50:06

HTTP Redirects (curl)

Time of First Successful Submission: 2026-04-19 05:51:20

HTTP Redirects (python)

Time of First Successful Submission: 2026-04-19 05:55:19

HTTP Cookies (curl)

Time of First Successful Submission: 2026-04-19 05:57:18

HTTP Cookies (netcat)

Time of First Successful Submission: 2026-04-19 05:59:41

HTTP Cookies (python)

Time of First Successful Submission: 2026-04-19 06:01:04

Server State (python)

Time of First Successful Submission: 2026-04-19 06:03:46

Listening Web

Time of First Successful Submission: 2026-04-19 06:06:43

Speaking Redirects

Time of First Successful Submission: 2026-04-19 06:10:57

JavaScript Redirects

Time of First Successful Submission: 2026-04-26 07:25:03

Including JavaScript

Time of First Successful Submission: 2026-04-26 07:27:30

HTTP (javascript)

Time of First Successful Submission: 2026-04-26 07:30:04

HTTP Get Parameters (javascript)

Time of First Successful Submission: 2026-04-26 07:31:54

HTTP Forms (javascript)

Time of First Successful Submission: 2026-04-26 07:33:47

cat

Time of First Successful Submission: 2026-04-26 07:43:44

more

Time of First Successful Submission: 2026-04-26 07:45:28

less

Time of First Successful Submission: 2026-04-26 07:47:03

tail

Time of First Successful Submission: 2026-04-26 07:47:24

head

Time of First Successful Submission: 2026-04-26 07:47:43

sort

Time of First Successful Submission: 2026-04-26 07:48:16

vim

Time of First Successful Submission: 2026-04-26 07:48:35

emacs

Time of First Successful Submission: 2026-04-26 07:49:26

nano

Time of First Successful Submission: 2026-04-26 08:02:29

rev

Time of First Successful Submission: 2026-04-26 08:03:34

od

Time of First Successful Submission: 2026-04-26 08:15:14

hd

Time of First Successful Submission: 2026-04-26 08:19:07

xxd

Time of First Successful Submission: 2026-04-26 08:23:17

base32

Time of First Successful Submission: 2026-04-26 08:27:16

base64

Time of First Successful Submission: 2026-04-26 08:27:48

split

Time of First Successful Submission: 2026-04-26 08:30:46

gzip

Time of First Successful Submission: 2026-04-26 08:35:49

bzip2

Time of First Successful Submission: 2026-04-26 08:37:33

zip

Time of First Successful Submission: 2026-04-26 08:55:30

tar

Time of First Successful Submission: 2026-04-28 07:47:02

ar

Time of First Successful Submission: 2026-04-28 07:48:58

cpio

Time of First Successful Submission: 2026-04-28 07:53:21

GCA CTF

10 / 104 20520 / 45039

Using the Terminal

Time of First Successful Submission: 2026-04-05 17:28:41

Using the VSCode Workspace

Time of First Successful Submission: 2026-04-05 17:34:29

Using the GUI Desktop

Time of First Successful Submission: 2026-04-05 17:41:08

Pasting into the Desktop

Time of First Successful Submission: 2026-04-05 17:43:33

Restarting Challenges

Time of First Successful Submission: 2026-04-05 17:48:48

Challenge Programs

Time of First Successful Submission: 2026-04-05 17:53:04

The Flag File

Time of First Successful Submission: 2026-04-05 18:14:57

Using Privileged Mode

Time of First Successful Submission: 2026-04-05 18:28:39

Persistent Home Directories - One

Time of First Successful Submission: 2026-04-05 18:31:06

Persistent Home Directories - Two

Time of First Successful Submission: 2026-04-05 18:31:59