Conway's Game of Life, in scratch! Probably not original... but whatever! There's a todo list inside for features to add, I might do them myself, but could be a good idea if you want to tackle it yourself.
Thanks to https://conwaylife.com/ for helping me test everything. (As always: be careful when going offsite!) Please do let me know if you see any bugs! I also do suggest using TurboWarp to run this, as large grids such as these can run quite slowly. TurboWarp link: https://turbowarp.org/807722386