GTFO

GTFO does not want casual players. That is not an accusation, it is a design choice, and if you accept it, the game gives you something rare: a co-op horror experience where failure actually teaches you something specific. One person makes noise at the wrong moment and the whole run collapses. Four-player communication here is not a bonus, it is survival infrastructure. My group with Left 4 Dead 2 and Helldivers 2 in heavy rotation took to this faster than I expected, because the habit of actual coordination transfers. Accessibility score is low and deservedly so, new groups will bounce. But for a committed squad that communicates properly, the tension GTFO creates in a single expedition is among the best on this list.

GTFO is the one game on this list where I would actually suggest running a briefing before you start. Not a long one, but someone needs to explain what the alarms do, what sleeper clusters are, and why you do not, under any circumstances, fire a weapon without checking with the group first. The horror here is not jump scares. It is the sustained dread of knowing that one mistake wakes everything in the room and you probably cannot recover from it. For a coordinated four-player group that wants to feel genuinely under pressure together, nothing else on this list comes close. For a casual LAN with mixed commitment levels, this will break hearts. Know your group before you install it.