Robocode - Robocode is a programming game where the goal is to code a robot battle tank to compete against...
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CeeBot - CeeBot is a brand new concept with which you will learn programming while having fun.
CodingInterview - CodingInterview offers essential information to help you conquer programming interviews.
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Interview Cake - Free practice programming interview questions. Interview Cake helps you prep for interviews to land offers at companies like Google and Facebook.