It was a good year for gaming. Super Mario Galaxy and BioShock are very close in my ranking, with Halo 3 in third place. I'd probably have to give the edge to Super Mario Galaxy for the #1 spot, but only barely. The gameplay was overall more fun, and as I weigh things most heavily on gameplay, that's just enough to give it the edge, though BioShock had some solid gameplay of its own and one of the most engrossing game worlds ever.
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In accordance to the VGC forum rules, §8.5, I hereby exercise my right to demand to be left alone regarding the subject of the effects of the pandemic on video game sales (i.e., "COVID bump").