CoolROM.com's game information and ROM (ISO) download page for Yamada Yuusuke World Puzzle - Bokura no 48 Jikan Sensou (Japan) (Sony Playstation Portable).
NOTE: Play this ISO on your PC by using a compatible emulator. New? Read our tutorial! »PSP emulator: PPSSPP (Windows) | OpenEmu (Mac) » You need to extract this ISO using: 7-Zip (Windows) | The Unarchiver (Mac)