2D Mario. With the exception of Yoshi's Island.
Mostly talking about the first four games, but it also goes for the New series. I suck at them, I die hundreds of times and never beaten a single one. I own all of them, in their original form no less as well as some remakes and ports. Still, I play the better ones fairly regularly and SMB3 to me ranks among the best games ever made. I'm finally commiting myself to a serious playthrough of SMW and while I died more than I can count, I'm in World 6 at least. Playing my old Super Mario All-Stars + Super Mario World cartridge
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