[jnpatel]

I like that that this implementation lets you shift right/left for a split second after you let the piece fall.

Not all Tetris versions I've seen do that. I'm not sure what official behavior, though.

[0x0]

There's quite a few details about the official authentic tetris guidelines here, looks like it's probably reverse-engineered. https://tetris.wiki/Tetris_Guideline