Boulder Dash

There is a way to access Boulder Dash Part 2 from the attract mode (Part 2 has the same levels, but increased difficulty). To access it, press the following key sequence while the player list is on the screen : A+Up, A+Down, Left, Right.

Wait until the player list appears during demonstrationmode, then press A + Up, A + Down,Left, Right. Part 2 has the same level structureas part one, but with a higher difficulty.

Press A + B while moving against rocksor moving walls to pass through them. Note: This will subtract20 seconds from your time.
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There is an escape mode that allows you to go through the stones and any moving walls. To activate it, press the A and B buttons at the same time while moving. There is a cost involved, though - it deducts 20 seconds for each stone or wall passed through.