Echoshift

 (known in Japan as Jigen Kairō) is a puzzle game developed by Artoon and published by Sony Computer Entertainment on 1 November 2009 in Japan and on 25 February 2010 in North America and Europe for the Sony PSP. The game featured seven DLCs, each containing new levels based around a theme, but with the shut down of the PSP frontend online shop they can no longer be obtained on the original console. The DLCs appears to have been delisted from the North American Store. The PS Vita release of the PSP version allows to download all of the content, but to be able to get everything on the original hardware a Sony PS3 is needed (see below for details). Unlike games, DLCs on Playstation 3 are region locked, meaning that NA games are not compatible with the PAL downloadable content.

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

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