Sound test:
Power on the system, then hold Run and press Select
ten times. Then, hold Select and press Run at the title screen.
Level select:
Power on the system, then hold Run and press Select
ten times. Enter one of the following codes at the
title screen to begin game play at the corresponding level.
Level Code
2 Up + Select + Run
3 Right + Select + Run
4 Down + Select + Run
5 Left + Select + Run
6 Up + Right + Select + Run
