Enter GFXJF as a password to change the ball into various objects, including a rag doll, space man, and alien.
Enter ZLJPJ as a password to change the gravity to match any planet in the solar system.
Enter ZNGGX as a password, and you can display the best time screen.
Enter WRJMH as a password, to immediatly teleport to the final level.
Enter QWNQP as a password. The title screen will appear again with the level number displayed. Press Up or Down to select any level from 1 to 99, then press Start.
Enter MHWYR as a password to access the second plane, or HCCWD to access the third plane of levels.
Enter NRRRP as a password, and the sound test option will be open to change.