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Every CTF
2021from the authors’ own sites

Sdctf AlternativeArithmetic 2021

1 challenge with 1 published solution between them. CTFtime has no listing for this event at all, so nothing built on CTFtime can show what it was made of. These writeups were found on the authors’ own sites instead.

Where these writeups live

Misc1

Everything that fits no other box: esolangs, puzzles, scripting exercises, and the jail escapes that have not yet earned their own category.

Other 2021 events