Overdump Data

There are games that contain overdump data from builds of other games. This is caused by development cartridges being reused, and leftover data from the previous game remaining. Overdumps are also sometimes known as "slack data".
==Nintendo 64==
Game 	Overdump Data 	Starting offset(s) 	Notes
Controller Pak Test Program v5.4 (Prototype) 	WWF Attitude 	Todo 	
F-Zero X (Prototype) 	Legend of Zelda: Ocarina of Time 	0x1000000 	SpaceWorld 1997 demo
Mario Party 3 (Prototype) 	Conker's Bad Fur Day 	0x2000000 	Matches Oct 25, 2000 build
The Legend of Zelda: Ocarina of Time (Feb 21, 2003 Debug) 	Conker's Bad Fur Day 	Todo 	Final PAL build
The Legend of Zelda: Majora's Mask (Sep 29, 2000 Debug) 	The Legend of Zelda: Ocarina of Time 	0x02100000 	Some leftover data towards the end of the ROM
Hercules: The Legendary Journeys (October 8, 1999 Prototype)	Ridge Racer 64 	0x10E0000 	Final PAL build
WipEout 64 (Prototype) 	Chameleon Twist 	0x800000 	Prototype build
Tommy Thunder 	Robotron 	0x3DA4C0 	
Blues Brothers (#20) 	Roadsters 	0x1000000 	
Blues Brothers (#53) 	Roadsters 	0x1000000 	
Controller Kensa-ki NUS-yo N Cassette 	Unknown game or demo 	0x2000000 	
Rugrats - Scavengers 	Scooby-Doo! - Classic Creep Capers 	0xE00000 	
Taz Express 	Daffy Duck Starring as Duck Dodgers, PGA European Tour	0xC00000, 0x1000000	Uncommon scenario having multiple overdumps.
Tony Hawk's Pro Skater 2 (v012) (2001-06-04) 	Spider-Man 64 	0x1000000 	Matches final.
THQ-Eurocom N64 Test Cartridge (prototype) 	Duke Nukem: Zero Hour 	0x800000 	Significant differences from final. Early textures.
==Nintendo 64DD==
Game 	Overdump Data 	Starting offset(s) 	Notes
Super Mario 64DD - SpaceWorld 1996	Previous writes of SM64	0x15AB90, 0x166010, probably more	Technically an underdump (previously-written data that begins before current build on disk). Several duplicate compressed MIO0 blocks, seems to match final. Second MIO0 block is partially overwritten.
==Super Nintendo==
Game 	Overdump Data 	Starting offset(s) 	Notes
Havoc (USA) (Demo) 	Super Mario World 	0x3F000 	Matches final
Super Donkey (Japan) (Proto 1) 	Legend of Zelda - Link to the Past	0x98000 	Possibly from a prototype build of Zelda LTTP
Super Donkey (Japan) (Proto 2) 	Legend of Zelda - Link to the Past	0x98000 	Matches Japanese final
Teenage Mutant Ninja Turtles - Tournament Fighters (proto)	Super Mario World 	0x3165C, 0x3F74B, 0x4E366, 0x4F477,many more	Many chunks of data from Super Mario World. Not sure if any are different from final. It's as if chunks of TMNT were written over SMW.
==Game Boy==
Game 	Overdump Data	Starting offset(s)	Notes
Splitz (Altered build)	Populous 	Todo 	64 kb leftover
==Game Boy Advance==
Game 	Overdump Data 	Starting offset(s)	Notes
SEGA Rally Championship (Prototype)	Sonic Advance 2	Todo 	Contains half of an unknown build.
==Nintendo DS==
Game 	Overdump Data 	Starting offset(s)	Notes
Robogear 3D Tactics (prototype)	Pirates of the Caribbean: At World's End	Todo 	
==Sega Mega Drive==
Game 	Overdump Data 	Starting offset(s)	Notes
Yu Yu Hakusho: Makyou Toitsusen (June prototype)	Sonic Crackers, J. League Pro Striker 2, Streets of Rage 3	Todo (many) 	
Sonic the Hedgehog 2 (Nick Arcade prototype) 	Sonic the Hedgehog, ToeJam&Earl 	0xE0180, 0xE1670 	Both overdump contents seem to match final
==Game Gear==
Game 	Overdump Data 	Starting offset(s)	Notes
Frogger (prototype)	Streets of Rage	Todo 	Matches final?