The phrase "deadly game" refers to a dangerous or life-threatening activity or situation in which there is a high risk of injury, harm, or death. Full definition
She takes her sister's place in deadly games run by the government in which children are forced to fight to the death. (csmonitor.com)
An amusement park king who makes life - and - death thrills his life's goal, Price has found a new deadly game. (cinematter.com)
The real juice here, though, is in the multiplayer, which pits teams of players against each other in deadly games of cat - and - mouse... except the mice can attack from the shadows and the cats are armed to the teeth. (t3.com)