Sonic Classic Collection is heading to the Nintendo DS, but the Genesis-era Sonic games are only designed for one screen. What did Sega do with the other?
They used it for story sound bytes and a mini-menu. Icons let users pause, quit, and more importantly load and save. Sonic Classic Collection has a quicksave feature and it looks like you can use it anytime Sonic is under your control. Notice how the save icons are gone when Sonic is being swept away in Hydrocity Zone.