1) you unlock all first three cups on grand prix, you beat the bosses in story mode and win the time trial.
2)easy way download save game for cars and you wil get all characters :)
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Their is no cheat to unlock all the characters all at once.Only cheats to get the characters seperatly.
yes there is a code if you enter xbwtl it will unlock all the characters for you.
get naruto six tails kyuubi in awu 3 to unlock all characters
unlock all the other characters first
done the tournament mode and you unlock thanos