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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.

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Today's Challenge
tchentchen
Iframe Sandbox
Web
Very Hard
1 solve
Submissions (latest 3)
panya
panya

SOLVED!

May 11, 4:24 PM

Leaderboard
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Writeups

Writeup for The Sandbox

umineko

ja
The Sandbox

yesterday

pppp4649

Writeup for Life is probably full of bugs

author
ja

yesterday

tadanobutubutu

Writeup for Bulk Note

tadanobutubutu

Writeup for Is this Twisted?

Rows:

Iframe Sandbox

Topic: iframeReleased: May 12, 2026

1 solve
Web
Very Hard

by

tchen

tchen

USER

SOLVED AT

panya

panya

1 hour ago

Rows:

descriptionsolves