The Impossible Bottle

This is an excellent game, with a really strong central premise that opens up a whole world of intriguing possibilities. Playing this shortly after Counterfeit Monkey inevitably raised comparisons with that game: Impossible Bottle is much smaller, and part of the fun here is working out the mechanic for yourself rather than being instructed in it, but it's similar in that once you understand how it works there are all sorts of crazy experiments you can try.

I'm not great at puzzles, but I solved all of them myself apart from (Spoiler - click to show) getting into the bottle, for which I did have to rely on the very well implemented hint system. I think I simply hadn't appreciated the sheer scale of the central conceit! I do feel that some of the puzzles are rather unintuitive, but the writing is charming enough that it gets away with it.

I like to interpret all the weird goings on as taking place in the protagonist's imagination, but of course you could read it differently...