Nakajima Satoru F-1 Hero GB: World Championship '91 (Gameboy)
CheatingDome.com
Difficulty levels
At the Mode Select screen, select Grand Prix - Continue, and enter the following.
Effect
Password
Level 2
3534370A
Level 3
29282AB7
Level 4
C2C3C6B4
Level 5
56575300
Level 6
9A9B9C1D
Level 7
1D1C1A35
Level 8
212029A6