The SourceMod community has brought us versions of everything from Goldeneye and Doom to Sonic and Mario Kart coded inside Valve's popular 3D engine and scripting environment. But the recently unveiled SourceMod Entertainment System is the first instance we can recall of a game designed to be played by characters in an existing Source engine game.
As shown in the below video, Counter-Strike: GO players on the Reflex Gamers servers can pick up a cartridge found in a modded version of the Office level and throw it in a recreated SNES model hooked up to the screen hanging on the wall. Next, they can pick up a virtual controller and play a thinly veiled two-player Nintendo rip-off called Super Mareo Bruhs. Bruhs comes complete with goomba stomping and coin collecting, and players can enjoy the game-within-a-game while utterly ignoring the incoming grenades and live fire from the encroaching counter-terrorists.
The mod has an admirable devotion to verisimilitude, from the power light on the in-game SNES to controllers with buttons that actually depress as you control the game from your own keyboard. Video uploader skwumpy writes in the description that the mod itself took "months of playing with CS:GO modding" and "a little bit of maaaaagic" to get interactive video and audio to run on an in-game screen (and an engine) that is not designed for it. "The way it works is crazy!!"
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via http://arstechnica.com/gaming/2013/04/thanks-to-modders-gamers-can-play-super-mareo-bruhs-inside-counter-strike-go/