MGS3 Connectivity (Japanese/European Version only)
Metal Gear Acid
If you own the Japanese/European version of AC!D and the Japanese/European version of MGS3 , connect your PSP to your PS2 using the link cable and put the PSP on the "USB connection" option.
Then start or load a MGS3 game and you will have recieved the Stealth Camo and the EZ gun. You can then save your game and keep the items even after your PSP is disconnected.
This does not work on the US version.