I am confused between these two and wanted to know which sentence to use:
1)I was working as a developer on Johns game.
2)I was working as a developer on John's game.
From the little research that I did, it seems like I need to go with the first one. Because John's basically means "John is". Kindly let me know if I am correct and which one should I go with.
John is the name of a company/owner of the game.