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.

EffectPassword
Level 23534370A
Level 329282AB7
Level 4C2C3C6B4
Level 556575300
Level 69A9B9C1D
Level 71D1C1A35
Level 8212029A6