Ratchet & Clank: Size Matters (known as Ratchet & Clank 5 in Japan) is a 2007 platformer video game developed by High Impact Games and published by Sony Computer Entertainment for the PlayStation Portable and PlayStation 2. The game is the first Ratchet & Clank title on the PSP handheld. Development company High Impact Games was spawned from the original Ratchet & Clank developer, Insomniac Games. The story is about Ratchet and Clank as they are interrupted from their vacation to search for a kidnapped girl and encounter a forgotten race known as the Technomites.

Published by Sony Computer Entertainment

Released February 13, 2007