This time at DEFCON CTF quals there was a special task category, namely OMGACM or competitive programming. Here is a solution to OMGACM 3 task. We have a remote host that offers to play a race game:

Connected to grandprix.shallweplayaga.me.
Escape character is '^]'.
Use 'l' and 'r' to move. Don't crash.
Press return to start

OK, we send ‘\n’ to start and see a 5×8 track with different obstacles: (more…)