How do you play ratchet and clank size matters multiplayer mode on psp?

To play the multiplayer mode in Ratchet & Clank: Size Matters on PSP, you'll need to select "Multiplayer" from the main menu. You can choose between Ad-Hoc mode for local wireless play with friends or use the single-player mode to unlock multiplayer maps and weapons. Players can compete in various game types, such as Capture the Flag or Deathmatch, by selecting their characters and customizing loadouts. Make sure you have two or more PSPs connected to the same network for Ad-Hoc play.