Go to edit robot, go to the scrap yard by some weps: eg large built in flipper for 608 credits. Put it intosetup dave it go out then back into edit robot then go to setup weapons and it will be worth 1600 creds! you have earned almost 1000 credits!
Unlock All Robots, Arenas and Trophies
Log in with the name "JPEARCE".
Unlock Secret Levels
Once you have unlocked the Siberia arena, win the world championship and you will have access to the Kilimanjaro volcano level with 3 more tournaments.