可以和朋友在线一起玩的Silent Protagonist · Singleplayer游戏共 3 款，包括ACE COMBAT™ 7: SKIES UNKNOWN、Half-Life 2和Half-Life。
全部游戏: 3
Become an ace pilot and soar through photorealistic skies with full 360 degree movement; down enemy aircraft and experience the thrill of engaging in realistic sorties! Aerial combat has never looked or felt better!
Reawakened from stasis in the occupied metropolis of City 17, Gordon Freeman is joined by Alyx Vance as he leads a desperate human resistance. Experience the landmark first-person shooter packed with immersive world-building, boundary-pushing physics, and exhilarating combat.
Named Game of the Year by over 50 publications, Valve's debut title blends action and adventure with award-winning technology to create a frighteningly realistic world where players must think to survive. Also includes an exciting multiplayer mode that allows you to play against friends and enemies around the world.