I am so thankful I don't have to write four guides for LEGO Star Wars II. The PSP version is, for the most part, the exact same as the Console versions. With some differences, but thankfully I don't have to write anything for this version in particular.
This version excludes Bounty Hunter Missions, but in their place is the final levels of Episodes I, II and III from the original LEGO Star Wars are available. The Cantina area itself is a ghost town, consisting of only you and the Player 2 character. Gold Bricks are also removed from the Cantina, but the Gold Brick count is still 99. (18 added for the Challenge Mode). Also added is a new mode selectable for a level, Challenge Mode, I will get into this a bit more when I get to Complete Saga. But basically, it puts 10 blue canisters into every stage, and collecting them all in the time limit will, only in this game, unlock a couple characters (Excluding all three Obi-Wan's, Padawan and Jedi Anakin, Darth Maul and Count Dooku, as they are unlocked by completing the three prequel levels) from LEGO Star Wars. Blue canisters are generally a lot easier to find than normal canisters.
I will provide guides for the Challenge Mode levels here, but everything else is under the normal console guide.
And with that, I will get onto the other two handheld versions.