Alien Swarm: Reactive Drop 是一款免费的俯视角射击游戏，核心是小队配合与战术执行。玩家以俯视视角控制角色，在外星虫群中推进并完成任务。游戏在 Alien Swarm 的基础上扩展了地图、外星生物、游戏模式和武器，并支持 Steam 创意工坊，可以游玩社区制作的地图与挑战。
合作模式最多支持 8 名玩家组队，一起打完整战役。所有官方地图也支持单人游玩，可以配合经过强化的机器人队友。除了合作，游戏还提供 PvP 玩法，包括死亡竞赛、枪王、一击必杀和团队死亡竞赛。挑战模式是对游戏规则的修改，类似 Left 4 Dead 2 中的突变模式。Steam 创意工坊带来社区地图和挑战，新的合作战役也在其中。
游戏提供超过 100 个 Steam 成就，还有排行榜，可以和朋友比拼最快通关时间。观战功能经过改进，可以实时看到骇客小游戏和鼠标移动。武器方面新增了 Bulldog、Devastator 和 Combat Rifle，外星生物加入了半条命 2 的蚁狮守卫等。游戏还带有地图编辑器，方便制作和分享自己的内容。
Aliens: Fireteam Elite is a cooperative third-person survival game set in the iconic Alien Universe. Battle through hordes of different types of Xenomorph, customize your character and gear, and level-up as you try to contain this ever-growing threat.
A fast paced multiplayer shooter that pits aliens against humans in a strategic and action-packed struggle for survival!
Starship Troopers: Extermination is an up to 16-player co-op FPS that puts you on the far-off frontlines of an all-out battle against the Bugs! Squad up, grab your rifle, and do your part as an elite Deep Space Vanguard Trooper to take back planets from the Arachnid threat!
HELLDIVERS™ is a hardcore, cooperative, twin stick shooter. As part of the elite unit called the HELLDIVERS, players must work together to protect SUPER EARTH and defeat the enemies of mankind in an intense intergalactic war.
From Space is a solo and co-op action-shooter for squads up to four players. Take on the challenge of liberating the earth from an alien infestation with your friends, using over-the-top weaponry in a post-apocalyptic world with awesomely stylized graphics. The apocalypse has never been so much fun!
Pick a character and team up with three friends ‘cause it’s time to save the world. Experience intense FPS action as you obliterate hordes of terrifying monsters! You may not be on the best team of mercenaries, but you are… a Toxic Commando!