What are /r/Surreality's favorite Products & Services?

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Same. It's like the Monty Python of fantasy :P

There's some nice point-and-click adventure games based on it (sadly old and not available on GOG.com so you may have to use an emulator) and a [subreddit](/r/discworld).

Steam page

Demo, playable in browser (requires Flash)

The surreal quality comes from how even the dogs, birds and insects are sentient machines with no explanation of how they work, and there's absolutely no trace of humans at all or even a hint that they were ever there.

The machine city is surrounded by a bleak garbage dump similar to Earth in WALL-E, but pretty cozy inside. There is gorgeous hand-drawn artwork throughout the game, further giving the game a unique feel.