One challenge is accuracy. You have to research a great deal to make sure the events, locations, and characters are as close to the real story as possible. For example, if the true story involves a specific time - period like the Cold War, getting the technology and political climate right is crucial. Another challenge is making it engaging. A real - life spy story might be full of dull moments, so you need to find ways to spice it up for gamers.
I don't know for certain. It could be inspired by real events but could also be mostly fictional. Maybe check with the creators or read some reviews to get a better idea.
Most probably not. 'Spy On' is likely a product of the creator's imagination. While it could incorporate common spy tropes or themes found in real life, it's not based on a specific, factual account.