Yes, this is what me and Runehero123 (mostly Rune, since I'm busy with other projects) have been working on. However, don't be expecting whole new levels, because they're not. This is similar to the beta Banjo-Kazooie map being hidden for years, but due to Banjo-Tooie's RAM, it was much harder to come up with a working code that anyone could use.
Here's a working cosmetic Gameshark code for Banjo-Tooie
8101E006 XXXX - First Value
8101E012 YYYY - Second Value (Can be zero if no wish to merge)
8101BBB8 0800
8101BBBA 7800
8101E000 A08E
8101E002 FFFF
8101E004 201B
8101E008 3C01
8101E00A 8013
8101E00C AC3B
8101E00E 8608
8101E010 201B
8101E014 AC3B
8101E016 860E
8101E018 1CC0
8101E01A F6E3
8101E01C 0000
8101E01E 0000
8101E020 03E0
8101E022 0008
Recommended:
8012704C 0006 - Turns you into the bee, so you don't fall to your death and can fly around.
80127643 0000 - Maps "WARP TO" 00, used to attempt to avoid "wide angles".
Values:
1CF9 - SM - Spiral Mountain A
1CFA - SM - Spiral Mountain B
1CFB - SM - Banjo's House A (Cutscene)
1CFC - SM - Banjo's House B (Cutscene)
1CFD - SM - Grunty's Lair A
1CFE - SM - Waterfall A
1CFF - SM - Waterfall B
1D00 - Humba's Wigmam A
1D01 - Mumbo's Skull A
1D02 - Mumbo's Skull B
1D03 - TDL - Humba's Wigwam (Big) A
1D04 - SM - Digger Tunnel A
1D05 - WW - Humba's Wigmam B
1D06 - Humba's Wigmam B
1D07 - JRL - Wumbas Wigwam B
1D08 - SM - Banjo's House A
1D09 - FREEZE
1D0A - MT - Mayhem Temple A
1D0B - MT - Mayhem Temple B
1D0C - MT - Prison Compound A
1D0D - MT - Prison Compound B
1D0E - MT - Collumns Valut A
1D0F - MT - Kickball Stadium Lobby B
1D10 - MT - Code Chamber A
1D11 - MT - Jade Snake Grove A
1D12 - MT - Jade Snake Grove B
1D13 - MT - Treasure Chamber A
1D14 - MT - Kickball Arena A
1D15 - MT - Targitzan's Slighty Sacred Temple A
1D16 - MP - Targitzan's Temple A
1D17 - MT - Targitzan Temple Lobby A
1D18 - FREEZE
1D19 - GGM - Fuel depot A
1D1A - GGM - Crushing shed A
1D1B - GGM - Flooded Caves A
1D1C - GGM - Water storage A
1D1D - GGM - Waterfall Cavern A
1D1E - GGM - Power hut basement A
1D1F - GGM - Chuffy's Cab A
1D20 - GGM - Inside chuffy's boiler boss A
1D21 - GGM - Gloomy Caverns A
1D22 - GGM - Generator caverns A
1D23 - GGM - Power hut A
1D24 - GGM - Train station A
1D25 - GGM - Glitter Gulch Mine A
1D26 - GGM - Waterfall Cavern B
1D27 - GGM - Canary Cave A
1D28 - GGM - Crushing shed B
1D29 - GGM - Power hut B
1D2A - GGM - Gloomy Caverns B
1D2B - GGM - Power hut basement B
1D2C - GGM - Prospector's Hut A
1D2D - GGM - Flooded Caves B
1D2E - GGM - Generator caverns B
1D2F - GGM - Toxic gas cave A
1D30 - GGM - Water storage B
1D31 - GGM - Canary Cave B
1D32 - GGM - Fuel depot B
1D33 - GGM - Inside Chuffy's Wagon A
1D34 - GGM - Ordnance storage A
1D35 - GGM - Ordnance Storage entrance A
1D36 - GGM - Glitter Gulch Mine B
1D37 - GGM - Prospector's Hut B
1D38 - WW - Witchyworld A
1D39 - WW - Crazy castle stockade A
1D3A - WW - Crazy castle Pump Room A
1D3B - WW - Crazy castle lobby A
1D3C - WW - The Inferno A
1D3D - WW - Cave of Horrors A
1D3E - WW - Haunted cavern B
1D3F - WW - Train Station A
1D40 - WW - Star Spinner A
1D41 - WW - Dodgem dome lobby
1D42 - WW - Dodgem challenge
1D43 - WW - Mr. Patch A
1D44 - WW - Witchyworld B
1D45 - WW - Star Spinner B
1D46 - WW - Crazy Castle Baloon game/Hoop Hurry
1D47 - FREEZE
1D48 - FREEZE
1D49 - BETA - Three Doors
1D4A - WW - Train Station B
1D4B - MP - Balloon Burst
1D4C - JRL - Inside the UFO A
1D4D - JRL - Ancient Swimming Baths A
1D4E - JRL - Ancient Swimming Baths B
1D4F - JRL - Electric Eels lair A
1D50 - JRL - Electric Eels lair B
1D51 - JRL - Seaweed Santchum A
1D52 - JRL - Seaweed Santchum B
1D53 - JRL - Inside the Big Fish A
1D54 - JRL - Inside the Big Fish B
1D55 - JRL - Temple of the Fishes A
1D56 - BETA - Two Floors / Ceilings
1D57 - JRL - Jolly's A
1D58 - JRL - Lord Wu fak fak A
1D59 - JRL - Pawno's emporium A
1D5A - JRL - Pawno's emporium B
1D5B - JRL - Blubber's wave race hire A
1D5C - JRL - Seabottom A
1D5D - JRL - Temple of the Fishes B
1D5E - GGM - Water supply pipe A
1D5F - GI - Water supply pipe A
1D60 - JRL - Sea Bottom Cavern
1D61 - JRL - Beta Pipe A
1D62 - JRL - Beta Pipe B
1D63 - JRL - Jolly's B
1D64 - JRL - Inside the UFO B
1D65 - FREEZE
1D66 - TDL - Terrydacty Land A
1D67 - TDL - Bonfire Caverns A
1D68 - TDL - Styracosaurus family cave A
1D69 - TDL - Inside the mountain A
1D6A - TDL - Inside the mountain B
1D6B - TDL - Terry's nest A
1D6C - TDL - River Passage A
1D6D - TDL - River Passage B
1D6E - TDL - Train Station A
1D6F - TDL - Oogle boogles cave A
1D70 - TDL - Unga Bunga's Cave A
1D71 - TDL - Stomping plains A
1D72 - TDL - Terrydacty Land B
1D73 - TDL - Inside chompa's belly A
1D74 - FREEZE
1D75 - TDL - Terry's nest B
1D76 - GI - Grunty's Industries A
1D77 - GI - Floor 1 A
1D78 - GI - Floor 2 A
1D79 - GI - Floor 3 A
1D7A - GI - Floor 4 A
1D7B - GI - Floor 1 - Elevator shaft A
1D7C - GI - Basement A
1D7D - GI - Floor 1 - Train Station A
1D7E - GI - Floor 1 - Trash Compactor A
1D7F - GI - Floor 3 - Boiler Plant A
1D80 - GI - Floor 2 - Electromagnet Chamber A
1D81 - GI - Basement - Waste Disposal A
1D82 - GI - Floor 1 - Workers quarters A
1D83 - GI - Floor 4 - Cable Room A
1D84 - GI - Floor 4 - Cable Room B
1D85 - GI - Floor 4 - Quality Control A
1D86 - GI - Basement - Waste Disposal B
1D87 - GI - Floor 1 B
1D88 - GI - Grunty's Industries B
1D89 - GI - Floor 4 - Quality Control B
1D8A - GI - Floor 3 - Packing Room A
1D8B - GI - Basement - Repair Depot A
1D8C - GI - Floor 1 - Train Station B
1D8D - GI - Floor 4 - Clinkers Cavern A
1D8E - GI - Sewer Entrance A
1D8F - GI - Floor 2 B
1D90 - GI - Floor 3 B
1D91 - GI - Floor 4 B
1D92 - GI - Floor 4 - Cable Room B
1D93 - GI - Basement B
1D94 - GI - Floor 3 - Boiler Plant B
1D95 - GI - Floor 1 - Workers quarters B
1D96 - GI - Sewer Entrance B
1D97 - BETA - Small Map
1D98 - HFP - Icy Side - Boggy's Igloo A
1D99 - HFP - Lava Side A
1D9A - HFP - Lava Side B
1D9B - HFP - Icy Side A
1D9C - HFP - Icy Side B
1D9D - HFP - Icy Side - Boggy's Igloo A
1D9E - HFP - Icy Side - Train Station A
1D9F - HFP - Icy Side - Train Station B
1DA0 - HFP - Lava Side - Train Station A
1DA1 - HFP - Icy Side - Icicle Grotto A
1DA2 - HFP - Icy Side - Icicle Grotto B
1DA3 - HFP - Lava Side - Colosseum Kickball Stadium Lobby A
1DA4 - HFP - Icy Side - Inside the Volcano A
1DA5 - HFP - Lava Side - Chilli Billi A
1DA6 - HFP - Icy Side - Chilli Willy A
1DA7 - HFP - Coliseum Kickball A
1DA8 - HFP - Icy Side - Boggy's Igloo B
1DA9 - HFP - Lava Side - Chilli Billi B
1DAA - HFP - Icy Side - Chilli Willy B
1DAB - CC - Cloud Cuckoo Land A
1DAC - CC - Central Cavern A
1DAD - CC - Inside the Pot o' Gold A
1DAE - CC - Inside the Pot o' Gold B
1DAF - FREEZE
1DB0 - CC - Inside the Cheesewedge A
1DB1 - CC - Inside the Trashcan A
1DB2 - CC - Inside the Trashcan B
1DB3 - CC - Cloud Cuckoo Land B
1DB4 - CC - Central Cavern B
1DB5 - CC - Zubba's nest A
1DB6 - CC - Inside the Cheesewedge B
1DB7 - CC - Zubba's nest B
1DB8 - FREEZE
1DB9 - CK - Cauldron Keep A
1DBA - CK - Cauldron Keep B
1DBB - CK - Gun Chamber A
1DBC - CK - The Gatehouse A
1DBD - CK - Tower of Tragedy Quiz A
1DBE - CK - HAG Inside A
1DBF - CK - Final Boss A
1DC0 - FREEZE
1DC1 - JV - Jinjo Village A
1DC2 - IOH - Wooded Hollow
1DC3 - IOH - Wooded Hollow - Jiggywiggy's Temple
1DC4 - IOH - Plateau
1DC5 - IOH - Pine Grove A
1DC6 - IOH - Pine Grove B
1DC7 - IOH - Wooded Hollow - Heggy's Egg Shed A
1DC8 - IOH - Cliff Top A
1DC9 - IOH - Wasteland A
1DCA - IOH - Quagmire A
1DCB - IOH - Wasteland A
1DCC - IOH - Inside Another Digger Tunnel A
1DCD - IOH - Inside Another Digger Tunnel B
1DCE - IOH - Plateau - Honey B's Hive
1DCF - JV - Jinjo Houses
1DD0 - JV - Bottles House A
1DD1 - JV - Throne Room A
1DD2 - JV - Zombie Throne Room A
1DD3 - JV - Bottles House B
If you notice, there are three beta values. 1D49, 1D56, and 1D94. These are background models (maps) that were not accessible in the final version of Banjo-Tooie. Put these in the gameshark code, and you'll be able to play on them!
Here is the Youtube Video:
http://www.youtube.com/watch?v=KyWW4cj0wi0
1D49 - This map appears unfinished. It's simply three floating square doors. You can't actually play on the map unfortunately, it always gives "wide angles".
http://i33.tinypic.com/2s5z9mb.jpg (Note, that the clouds in the background are not part of the model, and neither is the actual door textures. I simply loaded this map over Jinjo Village)
1D56 - You start out in the air and fall. You'll find this stretched rectangle that you fall through, and at the bottom, an invisible floor. If you try to go through the rectangle again, it wont let you, so some collision detection is programmed in this, and it was most likely used as a roof. However, if you don't fall through the bottom and keep flying up, you'll notice another roof that you can fly through.
1D94 - Nothing to be said here, the map is so small, you'll quickly escape the map's dimensions and be warped to Spiral Mountain.
And that's it! This is every single "map model" in the game, and there is simply no more. There is no Tower room, Glowbo Cave, Stop n Swop room, Ridiculously Secret Area, or anything like this. How do I know that some of these are indeed freeze maps? Well, because they simply have no data (Which I checked in the ROM), thus it can't possibly hold a map. However, some freeze maps (not models) have object data (such as feather nests for example), so there's still more to see. We'll let you know when we get a working code for that.
Seen those Youtube videos of merged maps in Banjo-Kazooie? Now you can do this with Banjo-Tooie! Also, have shootouts on any map in the game! Want to have a shootout in Terrydactyland? Sure!