Jet Force Gemini Hints & Cheats

At the Title Screen (where Juno and the others run towards the screen) enter,
Once entered you will see it appear in the bottom-right corner of the screen!

To turn the code off you need to, Enter the code again on the same screen to turn Debug mode off.
I found this code back in 2003 and now released it to the public.

Get a gold Floyd Medal in the Goldwood Cave and Eschebone Thorax Floyd Missions

Get a gold Floyd Medal in the Ichor Military Base Floyd Mission

Go to the Mizar Palace center (after beating one of the levels in it) and get your Jetpack power ups after beating Mizar for the first time. Find the pyramid with 3 Mizar tokens and a Jetpack fuel pad. Use the jetpack to find a drone pad to turn into an ant. Now open the door that was previously locked to you and you will find the racetracks. Win the race to unlock Racing mode in Multiplayer.

To unlock Jeff & Barry Arcade Racing in Multiplayer, you must win first place playing Jeff & Barry Arcade Racing as Juno, Vela, or Lupus in the Ichor Arcade in single player mode.

To unlcok Jeff & Barry Arcade Racing II in Multiplayer, you must win first place playing Jeff & Barry Arcade Racing II as Juno, Vela, or Lupus in the Ichor Arcade in single player mode.

To get to these hidden worlds, just get to the ship in the areas listed below.

To get a different title screen, beat the game.

When you are out of machine gun ammo, kill an enemy with a pistol. Switch weapons to the one that is empty or low. Next pick up his gun. The bullets will now be compatible with the machine gun! As long as the equipped weapon is not the pistol or the shotgun, this will work.