Sonic 2 Recreation. Sadly it's still unfinished but has some great and unique levels as well as some improvements not found in other Sonic games or hacks. Mario Adventure is a great SMB3 hack that's been around for a while but can get can be pretty tough at times, especially in the final world.
I think it must be sonic 2 xl. the rings are onion rings and you grow fat and obese by eating them making you slower and you die of heart failure if you eat so much that you can't move anymore. You can lose weight while exercising. It's a funny take one the game with a surprisingly high production value.
