Note: This game is also titled Command And Conquer: Tesla Missions.

Ant missions
Set the difficulty level to "Hard", select "Campaigns", and go to England to access the ant missions.

Ant missions secrets
Use the Game Shark building modifier codes along with the vehicles and infantry menu codes while in the Ant missions to obtain the following:

Mad Tank = Queen Ant
Demolition Truck = Warrior Ant
Chrono Tank = Larva
Mechanic = Larva
Shock Trooper = 2 Larvae
Cheat Codes
Click on the "Team" button menu with Circle (or which ever button is currently configured as "Cancel") or the Right Mouse Button. Then, move the pointer over the following icons on the tool bar and press Circle ("Cancel") or the Right Mouse Button on each:

Invincibility
"Square", "X", "Circle", "X", "Triangle", "Triangle".

Nuclear attack
"Circle", "X", "Circle", "Circle", "X", "Square". -From: Johnyaya @ webtv.net

Parabomb
"X", "X", "X", "Circle", "Triangle", "Square". -From: gen_tj @ earthlink.net and Johnyaya @ webtv.net

Chronoshift
"Square", "Circle", "Triangle", "X", "Circle", "Circle". -From: jfalato @ sprint.ca

Money
"X", "X","Square", "Circle", "Circle", "Circle". -From: Johnyaya @ webtv.net

Instant victory
"Circle", "Circle","Triangle", "X", "X", "Square". -From: Johnyaya @ webtv.net

Lose mission
"Circle", "X", "Circle", "Square", "Square", "X".

Change ore to civilians
"Sqaure", "X", "Square", "X", "Sqaure", "X". -From: Johnyaya @ webtv.net and panchog @ mail.swbell.net

Civilians have names
"Sqaure", "Square", "Circle", "Circle", "Triangle", "Triangle".

Full map
"Triangle", "Triangle", "X", "Circle", "Triangle", "Square".