The designer or designers of the game own 100% of the copyright to it.
The games that are made and published in The Sandbox belong to the designer or designers of that game. As long as it does not violate another individual or entity's copyright or trademarks.
The designer or designers of the game will own 100% of the game. The person you are renting the LAND from does not own any part of your game, just the LAND it is built on.
When you upload content to The Sandbox, you grant us a worldwide, non-exclusive, royalty-free, perpetual, irrevocable, sub-licensable (through multiple tiers), transferable right and licence to use, reproduce, publicly display, distribute and adapt the publicly shared Assets and Games for the purposes of developing, distributing, providing, improving, and promoting the Services, our activities, and your publicly shared Assets and Games. You further grant TSB the right to use your name and trademarks, if any, in connection with our use of your publicly shared Assets and Games. More information: https://www.sandbox.game/en/terms-of-use/.