Can You Play Dead Rising 2 or 25 to Life on PSP? No.

Neither Game Released on PSP

Why Not on PSP?

The PSP's hardware (333 MHz MIPS CPU, 32/64MB RAM, no dedicated vertex shaders) couldn't handle the open-world zombie hordes of Dead Rising 2 or the large-scale urban combat of 25 to Life. Both games were built for seventh-gen consoles/PC with significantly higher memory bandwidth and fill rates.

PSP Alternatives in Similar Genres

• Open-world action: Grand Theft Auto: Liberty City Stories, Vice City Stories
• Zombie survival: Dead Head Fred (unique horror-action), Resident Evil: Origins Collection (remasters not on PSP, but RE: Revelations 2 on Vita)
• Squad shooters: SOCOM: Fireteam Bravo series, Syphon Filter series

Stick to native PSP titles for the best handheld experience.