Sonic the Hedgehog Egg on Toast Edition is a modification of Sonic the Hedgehog wherein the rings are replaced with Toast, the Chaos Emeralds are replaced with Chaos Toasters.
Aside from that there is a New Game Plus mode in which the toasters are replaced with Super Eggs and the special stages are more challenging, a super form is availible upon collecting all the Chaos Toasters.
A new ending is available upon obtaining the 7 Super Eggs....