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)