Use the scoreboard to keep track of scores for individuals or groups. The scores can be positive or negative.
Press the cursor button in the toolbar to control the tool. Click on '+' to add a point and '-' to deduct a point. You can adjust the number of scoreboards you want in the settings menu in the toolbar. You can name each scoreboard differently and give them distinguishing colours.
Close the menu by clicking on the settings button again next to the tool. Clear all scoreboards with the 'Reset' button.