A daily CTF challenge with a fun new puzzle every day
We publish one simple, beginner-friendly or educational CTF challenge every day!
Solve within 24 hours of release to appear on the leaderboard.
Discussion with friends or AI is welcome (account sharing is prohibited).
Sharing solutions is allowed only after 24 hours have passed since release.
Try the first challenge
Is this your first CTF? Let's begin by tackling the first challenge released on Daily AlpacaHack.
shiragi
serioton
minaminaominaminao
tchen
pppp4649
hiikunzserioton
trimscashminaminaohiikunzseriotonminaminaotchenminaminao
tan90909090
k0080tan90909090shiragipppp4649tchen
kakur41minaminaok0080Want a harder challenge?
Go to B-SIDEWriteups
Rows:
Topic: CUDAReleased: May 24, 2026
If you don't have a GPU, you can run chal_sm_75 on Google Colab:
chal_sm_75!chmod +x chal_sm_75; echo "<flag>" | ./chal_sm_75Author verified that challenge successfully works with T4 GPU(chal_sm_75) and 6000 Ada(chal_sm_89).