# Challenges
Choose a topic, check the difficulty and work towards your next solve.
Challenges marked Computer need a terminal or desktop tools.
53 challenges found | filtered
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Pushes
A cookie clicker game tracks your progress. Reaching the target legitimately would take forever. Is there a shortcut?
PHPFilters 2
A message board processes your input server-side. The frontend filters are just for show.
Math Challenge
Librarian 1
The librarian fetches books by name. What else can you ask it to read?
Forbidden 1
Access denied. The admin page is off limits.
Bear Ninja Cowboy 2
Another round of Bear-Ninja-Cowboy. The rules seem familiar, but the input handling has a subtle flaw.
Bear Ninja Cowboy
A rock-paper-scissors variant where Bears, Ninjas, and Cowboys battle it out. Win 30 rounds in a row to claim the flag.
Basics 6
Another gallery with server-side image loading. Look beyond what the page shows you.
Basics 5
A number guessing game with client-side validation. But does the server agree with the rules?
Basics 4
The server remembers who you are between requests. But who decides what it remembers?
Basics 3
A gallery page displays images from the server. Is what you see really all there is?
Basics 2
The server only trusts a specific type of visitor. Can you convince it you belong?
Basics 1
A simple login page guards a secret. Sometimes the answer is hiding in plain sight.