Five Nights at Freddy's 4

Briefly, the marine campaign of AvP creates tension by limiting resources and saves. The marine is given one life, a small number of quicksaves and is then sent into labyrinthine 10 minutes long maps. There is no reliable way to light the place: lights are destroyable, night vision has a limited range and flares last a few seconds. Geometry and darkness often prevent players from having the full grasp of the room they are in. Because it's so dark and pick ups are so few players don't spend time scanning every single room for health or keys etc like in nearly every shooter, meaning marinedude doesn't play like an idiot while still being able to strategize between a small bunch of pick ups and the other. This obfuscation in what you can see hides enemy movement and each alien comes with its own stealthy edge. Facehuggers are small and they naturally exploit the blind corners of the first person camera, predators are invisible and xenomorphs attack from blind spots using their climbing skills or jumping behind players for a backstab. Weapons are less interesting but come with their own drawbacks, such as the standart rifle featuring a powerful alternate fire, for tension, for the player to decide between a weak hitscan fire and an explosive projectile which may kill players themselves in cramped places every time the marine has to answer close assaults, usually in corridors with low ceilings, with acid pools limiting space to move on or level design tricking players as one can see in a very "Aliens" moment in the Stranded map. Tldr: it's simple fast shooting and surpassed horror design with some contrived assaults. Fast movement as defence coupled with hitscan and explosive fires as offense, which feel really good, and a frail avatar to make for somethig more exciting than the regular offering of shooters, including sequels and most monolith games.

A pseudo tournament with 3 single player campaigns, each coming with a different species for a new twist.

Warsow is easily understood as Quake with walljumps and dashes. Quake and clones such as Warsow own a smoothness other shooters don't have, deliberately avoiding current conventions such as headshots and achieving unrestricted speed in the process through movement mechanics used to build momentum, usually jumping and in this case dashing too. The only obstacles to such unrestricted movement are speed caps and other means to deal high unavoidable damage, such as hitscan railguns and sniper rifles, meaning players take less risky jumps while navigating maps and are less aggressive than what they could be. Yet besides all of this players are never stuck in one place to hug the ground like in the vast majority of shooters. The fact we are not dealing with headshot conditions also means perfect aiming isn't that important at low levels of gameplay. Military games are twitchy in that players must always aim at each others' heads, dying should they shoot a millisecond later than their enemy, and while quake avatars die fast they are more forgiving to players' skills than that. At high levels of gameplay perfect aiming turns into another tool besides your guns, while gameplay objectives shift to map control of the most powerful health and armor pick ups rather than just sticking to the moment to moment combat. This lack of headshots also makes for more readable enemy health, armor and generally gives a good idea of the damage players inflict, making for better info to help the most skilled players emerge along with their best plans. Warsow is free, easy to set up compared to quake games and many many lesser shooters. Otherwise it plays as straightforward as any arena, players running for the strongest health and armor pickups, thinking in terms of situations and all that, simple is best.