airsoft; survival game (with air guns)
Refers specifically to the recreational war game using airsoft guns that shoot plastic BBs. This is the primary modern meaning in Japanese.
wasei-eigo (Japanese-coined English), from survival game
I'm going to play airsoft with friends this weekend.
I bought goggles for airsoft.
game of survival; survival contest
A literal or broader sense: a game or contest where the goal is to survive, not necessarily involving airsoft. This usage is less common and may appear in video game titles or metaphorical contexts.
This show features a survival game on a deserted island.