How to copyright a game?

Hello everyone. I have finally finished my game in Unity.Also, I am ready to sell my game for the Mac and PC. However, I need some help on how to do it. Do I need a copyright to sell my game ? Also, I am new to this and how do the percentage of the sales work? Thanks.

Not sure if you’re outside North America, but if you are within North America the instant you publish your work it’s copyrighted to you(just throw up a notice in your game)

There’s a vast multitude of ways to sell your game, ranging from burning them to a disc then selling them lemonade stand style on the street doing everything yourself, to submitting it to a portal for sale and having them do some things for a cut of the profit. Percent based deals work on the principle that you receive whatever percent of the revenue you work out with the portal, and the rest goes to them. Some portals even have a minimum you have to sell before you get a payout, so you should read the fine print when submitting games to portals

No better place to look for info than the source (US only): What Form Should I Use? (FAQ) | U.S. Copyright Office