Dark Theme is a setting that you can toggle to change the background color of your Agar.io game. Instead of having the default white grid, the grid changes into a black grid. It can be better for your eyes, especially when playing at night. You can also use it to reveal the Spy skin.
- Despite several rumors, the infamous "Spy" skin does not change its color when the Dark Theme is active.
- Some other skins will be more difficult to see while using the Dark Theme.