Not only are there differences between the PSP and PS3 versions of Sony's puzzler echochrome (those differences amount to two different sets of puzzles, so players can get both and feel they've got their money's worth), but there are multiple PSP versions as well. Europe gets a UMD and more puzzles, Asia and North America get downloads. Now it turns out that the North American version has two fewer modes compared to the Asian version. Also, the North American version costs quite a bit less--$9.99 USD compared to around $38 USD, apparently. (Via Siliconera and PSP Updates.)