Ecco - the Tides of Time for Sega GameGear

Codes

Debug Menu:
Press and hold the Start Button in the game to show up the map of the level. Now press LEFT 1 2 1 2 DOWN 2 UPand you will be in a Debug Menu where you can select any level, listen to music, set invincibility and a lot more. (I've tested this code in a ROM and it didn't work, so if anyone could tell me if it works on his cartridge, I would appreciate it!)

Game Genie: (North America)

Start on Vents of Medusa:
014-20B-C4A
884-22B-2A2
004-27B-3BA

Start on Maze of Stone:
024-20B-C4A
884-22B-2A2
004-27B-3BA

Start on Sea of Darkness:
034-20B-C4A
884-22B-2A2
004-27B-3BA

Start on 3D Swimming Part 1:
044-20B-C4A
884-22B-2A2
004-27B-3BA

Start on Skyway:
054-20B-C4A
884-22B-2A2
004-27B-3BA

Start on Tube of Medusa:
064-20B-C4A
884-22B-2A2
004-27B-3BA

Start on 3D Swimming Part 2:
074-20B-C4A
884-22B-2A2
004-27B-3BA

Start on Getaway:
084-20B-C4A
884-22B-2A2
004-27B-3BA

Start on Asterite Cave:
094-20B-C4A
884-22B-2A2
004-27B-3BA

Start on The Eye:
0A4-20B-C4A
884-22B-2A2
004-27B-3BA

Start on Deep Ridge:
0B4-20B-C4A
884-22B-2A2
004-27B-3BA

Start on Sea of Birds:
0C4-20B-C4A
884-22B-2A2
004-27B-3BA

Start on Convergence:
0D4-20B-C4A
884-22B-2A2
004-27B-3BA

Start on 3D Swimming Part 3:
0E4-20B-C4A
884-22B-2A2
004-27B-3BA

Start on Vortex Future:
0F4-20B-C4A
884-22B-2A2
004-27B-3BA

Start on Globe Holder:
104-20B-C4A
884-22B-2A2
004-27B-3BA

Start on Convergence Part 2:
114-20B-C4A
884-22B-2A2
004-27B-3BA

Start on 3D Swimming Part 4:
124-20B-C4A
884-22B-2A2
004-27B-3BA

Start on New Machine:
134-20B-C4A
884-22B-2A2
004-27B-3BA

Start on Vortex Queen:
144-20B-C4A
884-22B-2A2
004-27B-3BA

Start on Semi-ending Part 1:
154-20B-C4A
884-22B-2A2
004-27B-3BA

Start on Semi-ending Part 2:
164-20B-C4A
884-22B-2A2
004-27B-3BA

Start on Atlantis:
174-20B-C4A
884-22B-2A2
004-27B-3BA

Unlimited air:
366-8C6-5DD
3E6-8E6-D56

Unlimited life:
21D-3C7-6E2