Question: what games are built into sega genesis?
Answer: "Sonic the Hedgehog" (Action/Platformer) ...  "Gunstar Heroes" (Arcade Shooter) ...  "Castlevania" (Adventure) ...  "Shining Force" (Role-playing Game) ...  "Dr Robotnik's Mean Bean Machine" (Puzzle) ...  "Ecco the Dolphin" (Adventure) ...  "Toe Jam & Earl" (Action)