Robot Wars

Cheat mode:
Enter JPEARCE as a name to unlock all robots, arenas, trophies, and 9,999,999 credits.
c.majneri.

Use any arena in free play mode:
Highlight a locked arena that is directly next to a locked arena in free play mode. Press D-pad + X when moving towards the locked arena. If timed correctly, the previously locked arena will be playable.

Switch robots:
Select "War Zone" at the main menu and choose any robot. After winning a match, the game will display your upcoming opponent. Press Select + A to play as your opponent against the robot that you last defeated.

Behemoth:
Win the Russian Rampage Cup.
dave_hemsom.

Chaos 2:
Win the Robot Wars World Championship Tournament Cup
c.majneri.

Diotoir:
Win the Rooftop Punishment (Japan).

Firestorm:
Win The Hamburg Heavyweight Cup.
dave_hemsom.

Hypnodisc:
Win the Flip Frenzy Tournament Cup as Chaos 2.
c.majneri.

Mortis:
Win the Liberty Lightweight Cup in the North America Arena with a bought lightweight class robot. Mortis can now be bought for 40,000 credits.

Panic Attack:
Win the Scrapyard Challenge (Sao Paulo).

Pussycat:
Win the Alpha Viking (North Sea).

Razor:
Win The Nerves Of Steel Cup.
dave_hemsom.

Terrorhurtz:
Win the Heavy Bomber (Siberia).

Thor:
Win the Robot Wars Championship Cup.

Kilamanjaro Jewel level:
Win the Robot Wars Championship (which also unlocks Chaos 2) to unlock the bonus Kilamanjaro Jewel level. Note: The Siberia level must already be unlocked.
richard davies.

Hint: Extra credits:
Purchase cheap armor and weapons from the junkyard and add them to your spares. Save the game and return to the main menu. Then, return to the robot setup screen. Sell the armor and weapons to get full price for them.

Hint: Studio, London: Easy win:
Push your enemy onto the flipper. After eight seconds, it will flip the robot and it will hopefully land upside down. Note: You can also be flipped as well. Also, when you go to dump a robot into the pit (by Shunt's CPZ), Shunt comes out without you going into the CPZ -- be careful.
Sgt_bash_fan.

Glitch: Bypass weapon restriction:
To do this, you must have at least 40,800 credits and have unlocked the Germany arena. Buy Mortis for 40,800 credits. Then, go into Professional mode, the Germany arena, and enter the Hamburg Heavyweight Cup. it says only swinging weapons are allowed (for example, axes), yet you can enter Mortis despite the fact it has a flipper. This will give you a big advantage over your opponents, as you can flip them over and then either push them in the water or the cargo hold.