Leo looked at the crumpled sticky note on his desk. It had one thing scribbled on it:
: If you have a serial number from the official site and want to switch to Steam, you can exchange it for a Steam key at the Steam Key Exchange. Troubleshooting city car driving enter 121 activation key pc link
Ensure your installer version matches the key you bought. A key for version 1.5 will not work on version 2.0. Leo looked at the crumpled sticky note on his desk
Players with an old standalone serial number can often exchange it for a Steam Key to use the modern platform version. A key for version 1
Finding a functional activation key for an older version like City Car Driving 1.2.1 can be difficult, as the game's developer, Forward Development
"I downloaded a 'PC link' for City Car Driving with a list of 121 keys. My antivirus went crazy. After forcing the crack, the game crashed every time I hit the brake pedal. I ended up buying it on Steam – best $25 I spent."