LBP for the PSP attempts to bring over what made it so fun on the PS3 to its portable counterpart.
First off, the single player levels and presentation is great. The narrator from the first game returns and is just as funny and interesting as in the last. He tells you how to play, then sends you off into single player mode where you'll be collecting the majority of the things you'll be using in create mode. The levels look great, are imaginative, and shows you some interesting boss battles that will likely give you some ideas for your own levels. It's tough to spot any problems here aside from there being only 2 planes now, but the real gameplay lies in create mode.
Here is where things get shakey. Create mode behaves much like it does in the PS3, with some differences to optimize it for the PSP. Almost all of the tools are still there, some of the menus are slightly different, you still have your objects and stickers from single player mode, with the only real exception being decorations. Creating your own objects in this version is a bit of a pain. You have two categories of objects to create, shapes, or a brush tool of either a circle or a square, both made out of whatever material you wish. The shapes just create a shape, which you can make thin or thick, big or small, rotate it and place it wherever you want. The brush, however, gives you a fixed size square or circle that you can draw on a grid. You can only draw in four directions, you cant make hollow shapes (as in closed on all sides), and drawing the outside of a box automatically fills the whole thing in. While they were considerate in making creating objects a little easier, they severely limited the kinds of shapes you could make. Once you create your objects, the only thing you can do with it is move it, rotate it, resize it, or delete it. No on-the-spot editing this time, once it's made, it stays that way. This means doing something as simple as cutting out a circle from a square becomes a tedious, process using the corner tool, and your shape will never be perfect. Even with the gridded brush tool, they failed to include a grid feature for everything else, which was a great way to get everything a uniform size. To their credit though, they did add a new feature and tweaked some of the tools. For example, objects can now be set as static or movable, getting rid of the need for the anti-gravity material, and pistons now come pre-tweaked stiffened rather than floppy, which was annoying in the original.
To add onto all this, some of the tools are a little buggy. Getting some tools to attach to objects is a pain with the small screen and less-than-precise popit, and there's no grid to snap to for making exactly horizontal or vertical pistons, ropes, elastics, etc. To make it worse, wobble bolts will reset their direction to center on the position they are when play mode is initiated, meaning if you're trying to get a platform to wobble from left to right, you may find it being wobbled up and down instead when you hit play mode!
LPB made a great game, no doubt. Single player is a blast, online is supported so you can share games with your friends (no multiplayer though, unfortunately), and your sackboy/girl is as animated as ever. Create mode is a little dinged up, but it has the disadvantage of having to live up to the original. You still have your excellent selection of goodies and stickers, and most of your freedom in creation mode is intact. Chances are, you can still make practically any level you can dream of, but it might not be quite as shiney and it could take a bit longer to do. It gets the job done, which is enough for some people. If you can get past the hindered create mode, this game will be a great addition to your PSP collection.