Holy shit, how did that happen? do you remember what you bought when it went to -3000? The save is located in C°\users\USERNAME\appdata\local low\Mr_Z it's called KYFC.sex, you can just delete it. Sorry that happened : º(
I will re-check everything there, just in case. The file shoudl be there C:\Users\(yourUsername)\AppData\LocalLow\Mr_Z\Kinky Fight Club As the game is designed for windows, and windows 10 is where it better performs!
