Level select
When "Press Start" appears at the title screen, press Down(2), Up(2), Left, Right, Up, Down.

Level portals opened
When "Press Start" appears at the title screen, press Up(2), Down(2), Left, Right, Up, Down, A. All level portals can be opened without collecting the required fairies.

99 lives
When "Press Start" appears at the title screen, press Left, Right(3), Down, Up, Right, Up, A.

Unlimited health in Sparx worlds
When "Press Start" appears at the title screen, press Down, Up(2), Down, Left, Right(2), Left, A.

Unlimited weapons in Sparx worlds
When "Press Start" appears at the title screen, press Down, Right, Up, Left(2), Up, Right, Down, A.

Extra Sparx weapons
When "Press Start" appears at the title screen, press Right, Up, Right, Left, Down, Up, Left, Down, A. Then, use one of the following commands during a game in Sparx worlds:

Invincibility shield: Press Up + Select.
Smart bomb: Press Right + Select.
Rapid fire: Press Left + Select.
Homing bombs: Press Down + Select.
All keys: Press L + Select

Infinite lives
Go to the House Of Winter Fairies and from the portal go down until you reach a jar with a life. Enter the portal to go to the house of Autumn Fairies. If you return to the Winter Fairies, you will find the jar again. Repeat the process to get unlimited lives.

Quick glide stop
When gliding in the air after jumping, press A again to immediately stop and drop to the ground