Thanks for the feature suggestion! I've gone ahead and implemented random valid stacking order. So if you reload the page, and enter text that repeats the same letter more than once, you will hopefully get different build orders (depending on random choices). For example: https://erikdemaine.org/fonts/tetris/?text=aaaaa&rotate=0&sp...

Making a great thing even greater :)

Congrats on such a neat idea so nicely executed ...

Yes. I think the "recipes" are hardcoded.-

This is neat, but yeah, another fun challenge: have it build a letter/word/pixel art from random pieces, the best it can.