Description taken from PlayStation Portable version of this game

In the spirit of Lode Runner and Dig Dug comes Lemmings, an adventure puzzle game for PSP. Players will be kept busy with more than 150 levels, guiding the cute, little (though easily lost) lemmings from entrance to exit point. Around each corner hide obstacles, ranging from lava pits to raging rivers, requiring players to be fast with their wits and reflexes in order to guide the lemmings to safety. If 150 levels simply isn't enough, players can create their own custom levels, using the level editor function, and share them with friends using the PSP's wireless capability. ~ All Game Guide