Z Key Level

This level is available from the A Level. On entering from ground level, you are told "FIND ANOTHER WAY IN".

You can access this level from another door by either:
 * O Level, in a secret door hidden behind Blue Cubes.
 * C Level (requires C Key) has a door on the left side which links back to level A, up near the top of the Z key tower (but it is labeled U key at the top of the tower).

There is a portable save room collector you can purchase for $35, and some special bombs which can be used to blow up the special bricks. You can push the bombs off the sides to fall in save room collectors.

Near the bottom is a bunch of items and another boss fight.

You can get the Z Key once you destroy the boss.