Ape Quest

 is an RPG game developed by Shift and published by Sony Computer Entertainment on January 10, 2008 in North America, on May 1, 2008 in Europe and on March 19, 2009 in Japan for the Sony PSP. The game featured 3 DLCs, each giving access to a new chapter. The PS Vita release of the PSP version allows to download the DLC, but to be able to get it on the original hardware a Sony PS3 is needed (see below for details). The DLCs appears to have been delisted from all the stores except fo the NA one. Unlike games, DLCs on Playstation 3 are region locked, meaning that PAL games are not compatible with the North American downloadable content.

How to obtain
The DLC can still be obtained on the PS Vita (PSP) release from the Playstation Store or, on the PSP, by purchasing the PSP version on a Playstation 3 system and then transferring the content on the handheld console.

A guide on how to transfer content can be found here.