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Demonic Spiders: In Columns II, some blocks will turn into skull blocks. Clearing out a skull block will cause the bottom of the playfield to rise up by a few cells.
Older Than They Think: If you're familiar with the series' more intricate physics, you'll notice that some of them[1] are taken out of Sega's 1988 Tetris game.
↑in particular, the delay between a piece hitting the floor and it locking, fast sideways movement, and the delay between piece lock and the next piece