The PSP's greatest strength also proved to be one of its biggest downfalls -- it was just too expensive to develop for a handheld with ostensibly modern graphics. So while the launch line-up was solid enough, new PSP games arrived at a trickle compared to the flood of new Nintendo DS games that same year. In 2005 alone, the Nintendo DS had heavy hitters like Advance Wars: Dual Strike, Castlevania: Dawn of Sorrow, Mario & Luigi: Partners in Time, Animal Crossing, Phoenix Wright, and Osu! Tatakae! Ouendan! -- games that would help define the system's library for years to come.