Cheat mode:
Press Analog-stick Right(3) at the character selection screen then 
press Analog-stick Left to highlight and select Lupus. When game 
play begins, press C-Right(3), C-Left, C-Right(2), C-Up(3). The 
sound of Lupus barking will confirm correct code entry. Press A to 
cycle through the available weapons and items. Press B to drop the 
selected object at Lupus' current location. 

Rainbow Blood mode:
Collect 100 ant heads to unlock the "Rainbow Blood" option on the 
cheat menu. 

Jet Force Kids mode:
Collect 200 ant heads to unlock the "Jet Force Kids" option on the 
cheat menu. Enable this option to unlock the kid version of the 
game's characters. 

Ants Into Pants mode:
Collect 300 ant heads to unlock the "Ants Into Pants" option on the 
cheat menu. Enable this option to get stick figures with large pants 
as enemies. 

King of the Hill multi-player level:
Make contact with the hidden Totem Pole in Cerulean Holding Room. 

Tunnels multi-player level:
Make contact with the hidden Totem Pole as Vela in Rith Essa 
Waterfalls. 

Rith Essa Mine multi-player level:
Collect powered jetpacks. Then, make contact with the hidden Totem 
Pole in Walkway Station. 

Space Station multi-player level:
Make contact with the hidden Totem Pole in Space Station Basement. 

Goldwood Target Range multi-player level: 
Obtain a gold rank on the Goldwood Floyd level. 

Rith Essa Target Range multi-player level: 
Obtain a gold rank on the Eschebone Floyd level. 

Jeff And Barry Arcade Racing multi-player level:
Obtain a first place score on Jeff And Barry Arcade Racing at Ichor 
Arcade. 

Jeff And Barry Arcade Racing II multi-player level:
Obtain a first place score on Jeff And Barry Arcade Racing II at 
Ichor Arcade. 

Greenwood Village Race Track multi-player level:
Obtain a first place score on both Jeff And Barry Arcade Racing 
machines at Ichor Arcade. 

Mizar 3D Racer multi-player level:
Obtain a first place finish in the races at Mizar's Palace. 

Play as Yellow Ant in deathmatch:
Make contact with the hidden Totem Pole as Vela in Goldwood. 

Play as Blue Ant in deathmatch:
Make contact with the hidden Totem Pole in SS Anubis (Generator 
Room 2F). 

Play as Red Ant in deathmatch:
Make contact with the hidden Totem Pole as Juno in Ichor (Military 
Base). 

Play as Green Ant in deathmatch:
Make contact with the hidden Totem Pole in Spawn Ship (Cargo Sewer). 

Play as Male Tribal in deathmatch:
Play as Lupus and collect the Magenta Key in Eschebone (Thorax. left 
intestine). Then, make contact with the hidden Totem Pole as Lupus 
in Sekhmet (Channel Area). 

Play as Female Tribal in deathmatch:
Collect the Mine Key. Then, make contact with the hidden Totem Pole 
as Vela in Rith Essa (Mine). 

Play as Zombie Termite in deathmatch:
Then, make contact with the hidden Totem Pole as Lupus in Tawfret 
(Treehut). 

Play as Beetle Termite in deathmatch:
Then, make contact with the hidden Totem Pole as Vela in Tawfret 
(Tomb). 

Play as Metallic Termite in deathmatch: 
Make contact with the hidden Totem Pole as Lupus in Sekhmet, (hover 
across the Spiral Walkway). 

Play as Purple Termite in deathmatch:
Make contact with the hidden Totem Pole as Juno in Mizar's Palace. 

Play as Cyborg Ant in deathmatch:
Obtain an expert rank as Floyd on all Floyd levels. 

Alternate title screen:
Accomplish the following tasks during the game to unlock sequences 
on the title screen.

Rescue Vela (Juno and Vela run on their ship)
Put Floyd back together (Juno and Vela run and Floyd flying on their 
ship)
Have Lupus (All characters run on their ship)
Defeat Mizar once (All characters wearing upgraded armor run in 
Mizars Palace)
Defeat Mizar for the final time (Juno, Vela, and Lupus wearing regular 
armor walking down a runway on Earth) 

Quick character change:
Press C-Left or C-Right at the map screen to quickly change the 
character icons. 

Hear Lupus howl:
Press C-Down when playing as Lupus.

Super jump:
Hold C-Up to perform a super jump.

Fix the camera:
Players may notice that the default camera setting of Jet Force Gemini 
in one-player mode cuts off their vision left and right. For a much 
better camera view in one-player mode, go to the "Options" menu, turn 
on "Widescreen" (even if you are using a standard television or 
monitor), and press C-Up to raise the screen up several inches. Not 
only does this zoom back the camera, this also puts the game in a 
fish-lens and wide-angle view -- almost doubling your peripheral 
vision. This way, it will be much harder for the enemies to run out 
of camera range.

Avoid getting hit by flying objects: 
When reaching a section with small flying objects, run behind a tree 
and repeatedly run sideways to avoid getting hit. 

Abilities:
Juno can walk on fire (lava), Vela can swim, and Lupus can hover.

Hover with jetpack:
Press C-Down to hover with the jetpack. Note: This consumes less fuel 
then actively flying. 

Collect out of reach Gemini Crystals: 
To retrieve Gemini crystals that are in view, but out of reach, use 
any of the long range weapons to shoot them. They will bounce down 
to floor level.

Easy Mizar tokens, health, and ammo:
Return to Goldwood after finding the Tri-Rocket Launcher on Tawfret. 
There are two huts that have been left intact in the first Goldwood 
mission. Use the Tri-Rocket Launcher to blow up the doors to the 
huts. Inside one hut are twelve Mizar Tokens. You can exit and 
re-enter the hut as often as needed to collect additional tokens. 
The other hut contains a Diamond Geezer, who will refill all of 
your ammunition and health for some Mizar Tokens. 

Unlimited Mizar tokens:
Locate an area that contains Mizar tokens but no opponents, such as 
the beginning of the Spawnship or the rib cage in Eschebone. Take 
Mizar the tokens, then leave and return. The Mizar tokens will 
re-appear and may be collected again. 

Refill ammunition:
Switch to the shotgun, pistol or machine gun if running low on 
ammunition and run over the bodies of dead enemies to collect more 
bullets for that weapon. To refill the flame thrower, shoot Tribals 
once to force them to drop their lanterns without killing them. 
Collect the lanterns to use as flame thrower ammunition. 

Parts for Floyd:
Floyd's parts are in the very area that you meet him. One part is to 
the left of the cathedral/church, on the platform. After collecting 
that part, keep going, jump on the church, go to the left, go up the 
stairs, move to the fireplace, and jump in to reach a sewer. Take a 
right hand turn to enter a room. Choose the middle path to end up in 
a room with sparkling helicopter blades. Leave the sewer and locate 
a large building) like the church) with a metal door. Use Tri 
Rockets on it, enter the sewer again, and walk down the path to find 
another leg part.