While on a much needed vacation, Ratchet and Clank’s rest and relaxation time is suddenly cut short as they soon find themselves lured into a mysterious quest. Following the trail of a kidnapped girl, Ratchet and Clank rediscover a forgotten race of genius inventors known as the Technomites. They soon uncover a plot more dangerous than they could have imagined.

• Ratchet and Clank make their PSP® system debut, going back to the franchise's roots with classic Ratchet & Clank gameplay as playable Clank returns with all-new gameplay.
  
• Featuring new and returning weapons and gadgets, including the Shocker, Agents of Doom and Shrink Ray, Ratchet & Clank: Size Matters packs all of the combat and destruction fans have come to expect from the series.
  
• Players can utilize the all-new customizable armor system themed for various gameplay to gain upgrades and advance through challenging action-packed areas.
  
• Gain access to different vehicles to compete in races and combat enemies in intense battlefield missions.
  
• With wireless multiplayer gaming, up to four players can connect for intense combat and head-to-head action.

- From playstation.com