. . "Game Middleware" . "game development framework" . . . . "graphics middleware engine" . . . "sound engine" . . . . . . . . "underlying technology" . . "customizable game engines" . . "Game engine development" . "artificial intelligence" . . . . . "3D game engines" . "game development engine" . . . . . . "gaming/simulation engine" . . . . . . . . . "engine technology" . . "computer 3D simulation engines" . . . . "video-game development engine" . . . . "video game engine" . "engines" . . "physics engine" . . . "game engine" . . . "development engines" . . . . . . . . "game's engine" . . . "graphics engines" . . . . "game engine#audio engine" . . . . . . . . . "''Torn'' engine" . . . "in-engine" . . "graphics" . . . . . . . . . . . "engine for the game" . . . . "Gaming platforms" . . . "3D graphics engine" . "game development engines" . . . . "Middleware" . . . . "Game Engine" . . . . . . "graphics engine" . . "Engine" . . . "Game engine" . . . . . . . "Game engine" . "video game engines" . . "3D game engine" . . . "audio engine" . "middleware" . . . "development environment" . . . . . "Game engine#Game middleware" . . "in-game-engine" . . . . . . . . . . . . . . "game engines" . . "rendering engine" . . . . . . . . . . . . . . . . "gaming platform" . . . . "game's 3D engine" . "3D engine" . "graphic engine" . . "engine software" . "engine" . . . "MMOG middleware" . "3D video game engine" . "simulation engine" . "Game_engine#History" . . . .