Practice Fighting
When in Dexter's Diner, after unlocking some characters, go outside. All the characters fight with each other. Obi-Wan Kenobi and Qui-Gon-Jinn fight Darth Maul, Yoda is fighting Darth Sideous etc. Pick a player, by pressing triangle near them, and join in. It's great fun and great practice.
More tricks, tips and cheats for this game are right here - Lego Star Wars: The Video Game cheats
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