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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Learning software development through playing and contributing to a MUD: https://tashian.com/articles/how-i-learned-to-program/
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.
I really like base-2 prefixes in writing, e.g. 1 KiB, 2 MiB, 3 GiB and so on. It's way more explicit.
However, SI units are k M G and so on. Switching between lowercase k and uppercase Ki keeps tripping me up.