Here is one of the 6 in 1 one compilation of the PSP games released in Pal region. This Vol. 1 features about games that we're released first when its European release of PSP console came out. It ultizizules an PSP emulator called PPSSPP.

Notable 6 in 1 games included in PSP are:
Armored Core: Formula Front - Extreme Battle
Darkstalkers Chronicle: The Chaos Tower
Hot Shots Golf: Open Tee
Lumines
Ridge Racer
Dynasty Warriors