One of the most original games on PSP.
The goal in LocoRoco is to collect various items throughout the worlds. A few enemies hinder your progress but overall your blob faces very little danger in that regard. In fact, it is extremely easy to coast through the game and most people other than young children will be able to do so in a small handful of hours. Challenge isn't really what LocoRoco is about and the focus here is on exploration and item collection, which lends ample reason to replay levels that are already completed.
Overall, the lack of challenge for a simple playthrough ultimately made that aspect of the game feel a bit hollow. However, if you are one who likes to explore every nook and cranny of every level, LocoRoco offers a great deal of charm and really can't be beat in terms of creative presentation.