Check out PlayStation Network's double dose of brain benders for PSP.
Exercise your imagination
Adding a whopping 40 brand new, mind-bending mazes to your echochrome micro collection is the essential Expansion Pack. Stretching your powers of perception to the absolute limit, this Expansion Pack will push your powers of perception to the limit and beyond.
Guiding the mysterious Walker around each level on the hunt for Echoes, you'll have to watch out for chasms, launch-pads and dead ends that will block your path and render you quest impossible...or so it may seem. So go on, exercise your imagination even longer.
Are you the master?
Filled with thousands of questions on topics covering music, celebrities, TV, sport, science, nature, movies and general knowledge Buzz!: Master Quiz has been created especially for PSP. The game also features six brand new quiz rounds such as Quickfire Challenge, Picture This, and the mind-boggling Virus Challenge.
You can even play with up to six friends on a single PSP in Pass Around mode and, on top of traditional quizzing, some rounds in Master Quiz let you prey upon your opponents' weaknesses, letting you choose who to pass to based on subject matter. With this many questions and modes, there is something for everyone in Buzz!: Master Quiz, making it an essential download for your PSP.