The pickLink checked Oct 9
CodinGame
codingame.comCoding puzzles, bot battles and races in 25+ languages
FreeSignup required
Why it's the pick
Solve puzzles and write bots for little games in 25+ programming languages, alone or in quick timed races against other coders. Free, but you need an account; it's owned by CoderPad, which also uses it to help companies find developers.
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