If you don't know what sos: The Ultimate Game is here's a quick explanation. 
You and like 17 other people (I probably won't get that many people) and you all have the same objective: get a relic, shoot an SOS flare, escape. Only three people escape and you can form alliances with other people. 
Any questions? Also my fave youtuber played it with Snoop Dogg like wow congrats Ohm.