My team created this application for the 48 hour Clojure Cup hackathon. It's targeted at hackers looking for a fun way to sharpen their skills. It provides an interactive REPL, code editor (Ace), practice problems, and a game status / chat window for testing the practice problems and collaborating with other players.<p>Please try it out and vote for us if you like it. Comments and feedback are also appreciated, especially about any particular features you would like to see added next.