There's a fan-made game called Heboris, which is basically M.U.G.E.N for Tetris, that has many rulesets and the only one where you can do infinite rotation is TI-WORLD. All others have time limits(most common is 10 secs, there are 1 and 13 sec ones too) and some don't even have it. You need to get an unofficial patch(here: http://hebo.game-host.org/index.html ) though.
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