I wrote a number guessing game in bash. Arithmetic expressions and double brackets should keep things safe... right?
do the math
Topic: JailReleased: May 5, 2026
A CTF challenge series with fun puzzles to enjoy every day
We regularly publish simple, beginner-friendly or educational CTF challenges!
Solve each challenge within its time window to appear on the leaderboard.
Discussion with friends or AI is welcome (account sharing is prohibited).
Sharing solutions is allowed only after the challenge period has ended.
tchenTry the first challenge
Is this your first CTF? Let's begin by tackling the first challenge released on Daily AlpacaHack.
tchentchen
ark
pppp4649
hiikunztchentchenWant a harder challenge?
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