One Key is a puzzle platformer where the goal is to advance to the next room by using the key. There is however, only one key, and multiple doors. The key can only be used once and it's up to you to figure out the best way to use it.

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The game has nice art, nice sfx and interesting mechanics, but the difficulty ramps up to quickly. The level pictured below and the one before it, create difficulty that is frustrating; instead of fun. I quit out of frustration. Also, just let me control with WASD and jump with W.