I have these games on my PSP keeping me entertained whenever I am bored.
Games with bold names are my favorite.
N Plus - Platformer
Naruto Shippuden: Ultimate Ninja Heroes 3 - Fighting
Gladiator Begins - Action, Role-Playing
Untold Legends: The Warrior's Code - Action, Role-Playing, Adventure
Assassin's Creed: Bloodlines - Adventure, Third Person, Action
Patapon 3 - Role-Playing, Action, Rhythm Game
Monster Hunter: Freedom Unite - Action, Role-Playing
Rock Band: Unplugged - Rhythm Game
Fieldrunners - Tower Defense