This is a game for the SourceMod Entertainment System.
Here's an article about it: http://www.pcgamer.com/2013/04/16/csgo-super-mareo-bruhs/
CREDITS
- Code/Design - mukunda
- Music - S.S.H (http://www.ssh.ne.jp)
- Sound - Jake "virt" Kaufman (http://youtu.be/u9wp6cz0A1o)
- Graphics - Nintendo
Not endorsed by Nintendo.