B-SIDE
A daily CTF challenge with a fun new puzzle every day
What is B-SIDE?
This side program features challenges with a different flavor from Daily AlpacaHack. We publish one harder or more unconventional challenge every few days.
Join Anytime
Solve each challenge within its time window to appear on the leaderboard.
Not a Competition
Discussion with friends or AI is welcome (account sharing is prohibited).
Solution Sharing Rules
Sharing solutions is allowed only after the challenge period has ended.
New to CTFs?
This program features higher difficulty and unconventional challenges. Try the beginner-friendly Daily AlpacaHack first to warm up.
Today's Challenge
ark
arknodebox2 solves
Misc
Very Very Hard
Leaderboard
Period
Upcoming challenges reveal the , , and in advance. 
tan90909090 
minaminao ark
Mon
Tue
Wed
Thu
Fri
Sat
Sun
tan909090901-5minaminao
minaminao6-11
pppp4649
pppp464912-16
colza
colza
17-21minaminao
minaminaominaminao22-25minaminao
minaminao26-31ark
arkark1
Coming soon
2
Coming soon
