From the introduction:
Off This Rock! is a frantically paced, physical game, with some light comedic science fiction role playing elements. Players act as both the heroes and the villains on a malevolent alien world where chaos reigns supreme. Play as an intrepid Crew member of a deep space salvage vessel, trying to escape or as the malevolent will of The Rock trying to murder them. This game is meant to be played in groups of at-least 4 Players with one Game Master, and typically takes 5-10 minutes per game. Th is game is a great way to get moving between other games. It is advised you stretch before play. The only other requirements are space to play (an open area with room to move, at-least 15’ between teams), a chronometer (watch, phone, human counting) and these basic rules.