Special items:

10,000 point Hu-card
Dig 255 holes.

20,000 point NEC icon
Get all the chests without killing any enemies.

Extra life
Create 64 tombstones.

Expert mode level select:
Enter Blue/Back, Blue/Back, Red/Right, Blue/Forward as a password.

Level	Difficulty	Password
30	Normal/Difficult	Pink/Forward, Blue/Forward, Blue/Left, Pink/Backward
60	Normal/Difficult	Blue/Left, Blue/Left, Blue/Right, Pink/Forward
30	Expert	Blue/Right, Pink/Right, Pink/Left, Blue/Backward
60	Expert	Blue/Backward, Blue/Backward, Pink/Right, Blue/Forward