Hackceler8 is an experimental mix between CTF and speedrunning, with the top 8 teams of the GoogleCTF playing against each other in 7 qualification matches and a final. The whole thing was recorded and commentated, for your viewing pleasure.

The game was custom-made, with a lot of opportunities for cheating/abusing its mechanisms (this is a hacking competition after all), and the challenges were a mix between regular CTF challenges (reversing, shellcoding, etc) and game-based ones (prng manipulation, clipping abuses, visibility-based, etc).