B-SIDE
A CTF challenge series with fun puzzles to enjoy every day — B-SIDE
What is B-SIDE?
This side program features challenges with a different flavor from Daily AlpacaHack. We publish harder or more unconventional challenges from time to time.
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 ChallengeNo challenge is currently active.
Leaderboard
Period
Upcoming challenges reveal the , , and in advance. 
chocorusk 
Mon
Tue
Wed
Thu
Fri
Sat
Sun
chocorusk25-28
k0080
k00801-4
5-8
tchen
tchen9-12
hiikunz
hiikunz13-15
mora
mora16-18minaminao
minaminao19-22
rsk0315
23-25
pppp4649
pppp464926-29
rsk0315
30-31k0080
k00801-3minaminao
minaminao4-7hiikunz
hiikunz
