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Dreamcast - Jet Force Gemini cheats

Unlock Rainbow Blood option in cheat menu:
Accumulate 100 ant heads

Unlock Ants Into Pants option in cheat menu:
Accumulate 300 ant heads

Jet Force Kids option in cheat menu:
Accumulate 200 ant heads

Unlock bonus deathmatch characters:
Make contact with the hidden TOTEM POLE at the indicated location.

Yellow Ant: Make contact  as Vela in Goldwood.
Blue Ant: Make contact in SS Anubis
Red Ant: Make contact as Juno in Ichor
Green Ant: Make contact in Spawn Ship
Female Tribal: Collect the Mine Key. Make contact as Vela in Rith Essa.
Zombie Termite: Make contact as Lupus in Tawfret
Beetle Termite: Make contact as Vela in Tawfret
Metallic Termite: Make contact as Lupus in Sekhmet
Purple Termite: Make contact as Juno in Mizar's Palace.
Cyborg Ant: Reach an expert rating as Floyd on all Floyd levels.
Male Tribal: Unlock Lupus and find the Magenta Key in Eschebone.
Make contact as Lupus in Sekhmet.

Bonus multi-player levels characters:
King of the Hill: Make contact in Cerulean Holding Room.
Tunnels: Make contact as Vela in Rith Essa Waterfalls. 
Rith Essa Mine: Pick up powered jetpacks. Make contact in Walkway Station.
Space Station: Make contact in Space Station Basement.

Unlock Cyborg Ant: 
Reach an expert rating as Floyd on all Floyd levels.

Unlock Greenwood Village Race Track:
Reach 1st place score on both Jeff And Barry Arcade Racing machines at Ichor Arcade.

Unlock Jeff And Barry Arcade Racing:
Reach 1st place score on Jeff And Barry Arcade Racing at Ichor Arcade. 

Unlock Jeff And Barry Arcade Racing II:
Reach 1st place score on Jeff And Barry Arcade Racing II at Ichor Arcade. 

Unlock Rith Essa Target Range:
Reach gold rank on the Eschebone Floyd stage

Unlock Goldwood Target Range:
Reach gold rank on the Goldwood Floyd stage