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<3 <3 Bub and Bob
(Disclaimer: I pumped lots of quarters into Taito's original arcade version. If you want a free Windows version, grab frozen bubble here, and while its downloading, read the author's commentary here. It's also for sale for the PS, PS2, and Gamecube under 'bust a move' from ubisoft, unfortunately the US console releases were the defunct Acclaim's work)