Though a PlayStation 3 is required to download the games, they can only be saved directly to a PSP and not temporarily stored on the PS3's hard drive. After purchase, two files are downloaded - the game file (which can be up to 600MB or so) and the license file, a small document that prevents illegal copying.
A number of universal control schemes are available in each game, giving you the option of how to emulate the lack of the L2 and R2 buttons. Each configuration uses either the D-Pad or analog stick for inputting L2 and R2, either by using a directional press to trigger them or alt-shifting the PSP's L and R buttons.
By default, each game's description on the PlayStation Store comes with this bit of text: "This title has been converted from the original PlayStation disc to the PSP system. Consequently, there may be times where the title plays differently from the PlayStation disc version, or where some features do not function properly. This version does not support PlayStation peripherals (Controller, Memory Card, Multitap, etc.), therefore functionality such as multiplayer, versus, and co-op modes will not be available."
* Cool Boarders (283 MB)
* Crash Bandicoot (469 MB)
* Hot Shots Golf 2 (157 MB)
* Syphon Filter (385 MB)
* Tekken 2 (535 MB)