In Custom mode, the scoring method and the target number of points (1-3) can be adjusted. For the scoring method, you can choose between the existing methods of the rule sets (Mau Mau, Crazy Eights, 101, etc.) or play without any at all. The settings apply to both offline and online games. In online mode, the rules of the person who created the room and started the game apply.
You can get to the Custom mode as follows:
1. Open the menu in the upper left corner of the main screen of the app
2. Select the button "Settings"
3. Tap on the desired option (scoring method, target score) to make your selection