Ball Select
Enter GFXJF as a password.

Sound Test
Enter NRRRP as a password.

Change Gravity
Enter ZLJPJ as a password.

Display Best Time Screen
Enter ZNGGX as a password.

Level Select
Enter QWNQP as a password.

Passwords

Level   Password  
2       MHWYR  
3       HCCWD  
4       WRJMH