One of the first apps I made and actually put online was a tool to practice advanced techniques for Super Smash Bros Melee on the Nintendo GameCube 🙈
I was a total noob at the time, both at SSBM and writing code, so the code is abysmal, but the tool was actually really useful. It's basically a metronome that plays a sound on when you should input a particular button to practice an advanced move or technique in the game, and it helps to develop the muscle memory for it. The coolest thing was that I could plugin my USB gamecube controller and practice.
I recently took it offline, but it got quite a lot of users in the first couple of years I put it online which was really cool to see and a massive confidence boost; it's really nice to make something that helps people and that people like to use to get better.
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