oh noooooooo
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It's really hard to use I blocks when you're stacked high and only have a few lines left. It's a combo of (1) the rotation from horizontal turning the block down instead of up and (2) the game canceling a rotation if there's no space, which combine to make it impossible to turn one of those from horizontal to vertical. Especially the 6x1, no chance.
That's killed a couple of games ;_;