noun
game mechanics; game system
Refers to the rules, mechanics, and underlying systems that define how a video game operates. Used in game design and player discussions.
from English game system
このゲームのゲームシステムはとても複雑だ。
The game mechanics of this game are very complex.
新しいゲームシステムを搭載したRPGが発売された。
An RPG featuring a new game system was released.