Easy World Tournament
To easily win the World Tournament (the one with the ringouts):
Use a character with high attack speed like Burter or Gogeta (even saibamen works!)
They will start with full Ki. Make sure to pick one with a easy and quick blast attack (no rushes!)
When the word "Fight" appears, immediately use the blast to knock him/her off her feet and onto the ground.
Then rush to the character and keep on bashing Square so he will end up in the building behind him.
On high levels this might be a problem because they block or use sonic sway. In that case kick them into the air and use an Aerial Combo! (higher chance to knock them out of the ring with an oponnent with low health!)
Repeating this can give you a lot of Z Points, which helps you to buy the expensive "Aura Charge
Hope this helps!
We have more cheats and tips for this game here, Dragon Ball Z: Budokai Tenkaichi 3 cheats
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