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So there's this puzzle game, it was most likely MS-DOS but it could just as easily be a regular and ancient Windows game (we had Windows 98).
I don't really remember the premise or the characters much, but what I do remember is this very basic mechanic: it's a top-down view and you start in a specific location each level, and to win the level you have to reach a spot (perhaps collect something?) and return to where you started. The latter was a Timed Mission; the walls lining the edges of the screen would start turning into monsters that end the level on contact with the player, and if all of the wall tiles transformed, the monsters would begin moving about. The walls made noises when transforming.
I'm fairly sure you could select the level to play, and the one I remember in particular was a long corridor in a zig-zag pattern. I would have classified that one as That One Level because winning it was difficult; you had to make your way from the top of the screen to the bottom and then move as fast as possible to get back to the top to win the level, and with the only path you had being a long zig-zag, you'd have barely enough time to make it to the top section before the One-Hit Kill monsters started swarming.
As far as graphics go, I don't remember anything except the tiles etc. being overlaid over a black or similarly dark screen.