ImaginaryCTF
Work through an archive of past daily CTF challenges, with write-ups and flags
ImaginaryCTF is a capture the flag site that released a new challenge every day, with a leaderboard for players who solved them. Challenges cover categories such as crypto, reversing, web and pwn, each with a description and attachments.
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About ImaginaryCTF
The daily series appears to have stopped in 2025: the newest month in the archive is April 2025. The Archived Challenges page still lists past challenges by month, and each one comes with a write-up and its flag, so it works as a free practice archive.
You create an account to submit flags, and the team runs a Discord server with more than 6,000 members for help.
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