Loderunner 3D – Nintendo64

Loderunner 3D - Platform: Nintendo64

Level Select
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Pause, then hold Z and press 
R, B, A, B, A, C-Up, C-Down, C-Left, C-Right, C-Up, 
C-Down, C-Left, C-Right. 

Bonus levels
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Pause, then hold Z and press C-Down, 
L, R, L, R, L, R, L, R, L, R.