Sonic Melponterations is our take on what a "Sonic Generations expansion pack" could have been - three new stages, one for each of the game's three eras of Sonic history, and each one based off a game not seen in Sonic Generations already. Each stage is built from the ground up with original artwork, level designs, and remixed music. Currently we're working on Sky Troops, a stage originally from Shadow the Hedgehog, for the Adventure era.
Obviously requires the PC version of Sonic Generations; everything else you need to play the mod is included in the download. Please read the included readme file for instructions. Have fun!