I got Fast Fusion at launch but only really got around to play it now because I gave priority to some other games first. Really fun and the track design is good although I feel like they overtuned the stat difference between the base vehicles and the better fused ones. I initially tried to do everything with one of the base vehicles but it became impossible by the 100cc equivalent, so I made an A++ rank fused one and have been breezing through everything. I get it's the game's main gimmick, but it's a little too necessary.