The games can be played with three difficulty modes: Normal, Easy, and Original. Original mode is unchanged from the Genesis games, Normal mode slightly alters the stage layouts to create a unique (often less difficult) experience, and Easy mode adds platforms and removes many obstacles and some levels. New features include the ability to spin dash (introduced in "Sonic 2") in the first "Sonic the Hedgehog," play Special Stages separately, a "Time Attack" mode, and a "Time Out" option to disable time limits.