Developing a 4D platformer, and doing indie development slowly without alienating your fan base: https://www.vice.com/en_us/article/9kmknd/what-happened-to-miegakure-the-game-that-promised-the-4th-dimension
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One interesting aspect of collecting coins in a platformer like mario: it makes the level stateful.
You can see if you've been somewhere before based on whether there are coins present.