MOTAS, aka the Mystery Of Time And Space, is considered one of the earliest and most influential examples of room escapism. It's a sprawling beast indeed: there are twenty rooms in total, with the possibility of more being added at a later date. Expect weird sci-fi plot shenanigans aplenty.
Crimson Room is notable for its swanky 3D transitions. Definitely one of the more stylish entrants.
Colour Room Escape takes Crimson Room's chromatic aesthetic and turns it into a puzzle. Flipping switches alters the shade of the walls, among other things.
The popular Submachine games keep pixel-scrutinising to a minimum, focussing on mechanical and logic puzzles.
Things get gothic in The Doors, with all kinds of unpleasant sound effects and a nasty whiff of paranormal activity.
Fog Fall is a narrative-heavy specimen, set in a post-apocalyptic alternative America. With its stylised, "brushwork" visuals, it's also a gorgeous ride.
Swan's Room is similar to Crimson Room, but a little less, um, red. Gotta love that sofa and coffee table combo. It could really use a side table though (note: not-so-cryptic hint).
Not every room escape game is about escaping - in Domestic Bliss, the idea is to get in. You've just been chucked out of your own home - stark bleeding naked - by your enraged spouse. Perhaps the neighbours can help.
Strictly speaking Hapland 2 isn't a room escape game, but it's close enough (and more importantly good enough) that we had to include it here. Click on objects in the right order to free the little stickmen.
If you thought The Doors was unsettling, stay well away from Sleepwalker. Find your way through a wrecked building with the aid of a torch while some...thing hunts for you in the forest outside.