If you like tougher platformers, give it a shot...and if you learn their rhythms, they're not even
that
hard (MM9's a good example of that). Harder than Mario, yet nothing close to the likes of Super Meat Boy.
I recommend trying the 8-bit games (mostly NES-games), though MMX-fans will swear by that series as well. See what's good for you!
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Nominate
E P O N A
.