To play this safely, avoid the "highly compressed" traps and follow these steps:

These games are widely available as ISO or CSO files. "Highly compressed" versions often use the .CSO format to save space while remaining playable. How to Play God of War 2 on Android (PS2 Emulation)

: Move the downloaded ISO file to a folder on your device, ideally in a location easily accessible by the PPSSPP emulator.

While was originally released for the PlayStation 2 and was not officially released for the PSP, it can be played on Android using different emulation methods. Many "highly compressed" versions online are often modded versions of the PSP God of War titles or require a PS2 emulator instead of PPSSPP. Emulation Options for God of War II

: You will need the God of War II ISO file and a PS2 BIOS file to make the emulator work.

If the file is labeled .iso and is meant for PPSSPP, you are likely downloading God of War: Ghost of Sparta (which is the sequel to Chains of Olympus and a prequel to GoW 2).