No frills time trials come in 60, 90, and 180 second flavors. The standard challenge mode unlocks skins as you progress, which can then be used in a standard single skin mode, and a double skin mode that challenges you to contend with two boards of tiles at once. There's also an oversized 10x10 board that'll give your left thumb one hell of a work out. Trouble is, there's nothing here to vary the convoluted strategies you'll discover, even when playing a friend over an Ad Hoc Wi-Fi connection.
The PSP, with its bizarre animations and pulsing music, offers a sharper and much more satisfying overall presentation than the Nintendo DS version, but it lacks the goofy characters and CPU opponents, not to mention the handy ability to drag and swap tiles with the stylus.