This is pretty much MarbleRacer with 3 charchters, mario, luigi and bowser. Press d to change charachter. It also features that when you press left and right your charchter actually moves. This may be a bit glitchy but is only in beta mode so wait for 0.2 and some glitches will be fixed. BTW I think theres a glitc h with charachter switching that i think i know how to fix so i will try to in 0.2.\ Sprites from Spriters Resource and go to Mario Kart 64.