Not ideal, but if you only want the story, watching a walkthrough is safe and free.
A: No. Lossless compression cannot reduce game data that drastically. God Of War 3 Highly Compressed Download For Android 2021
Many websites and YouTube videos claiming to offer "highly compressed" downloads (e.g., 200MB to 500MB) for Android are often misleading or dangerous: Not ideal, but if you only want the
Often, the file is a modded version of a low-end fighting game (e.g., Shadow Fight 2 or God of War: Ghost of Sparta PSP emulated) re-skinned with GOW3 screenshots. the source website should provide it.
Extract the Data: Use an app like ZArchiver to extract the contents. If the file is password-protected, the source website should provide it.