If you have a psp with firmware 2.80 then there is a game demo for mercury meltdown unfortunatly it is in japanese but its easy enough to navigate arround the menus. To download go to this site http://www.jp.playstation.com/scej/titl … _pc_c.html and click on the download button. To put the game on your psp create a folder called UCJS10043 in the GAME folder in the PSP folder then you need to put the downloaded file in the UCJS10043 folder.