Quartet (Master sys)

CheatingDome.com

Larger beam

Press Pause(14) at the title screen, then press 1.

Level select

Press Pause(12) at the title screen, then hold Up/Left and press 1 + 2 on controller two. Note: This code may only be used to select levels in two player mode.

Sound test

Press Pause(4) at the title screen, then press 1 on controller two.