The game was developed by Tsutomu Kouno, striving to create a game that was different to other titles being released for the PSP at the time. Along the way, the LocoRoco can grow in size by eating special berries, and then can be split and rejoined to pass the LocoRoco through narrow spaces. When the Moja Troop comes to the planet to take it over, the LocoRoco do not know how to fight against these invaders from outer space. In each level, the goal is to reach the end point of the level, with the player scored on the number of LocoRoco found, the time to complete the level, and other factors. Manipulation of the LocoRoco in this manner may be necessary to guide them to the finish; while the single large LocoRoco is easier to control, small passages can only be navigated by individual LocoRoco. The player can lose LocoRoco if they are touched by harmful objects or they run into the Moja, and the game will be over if they lose all their LocoRoco. The player can use the accumulated Loco House parts to create a course that the LocoRoco will automatically navigate, with additional parts that can be collected by directing the course appropriately.
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