Use the onscreen keypad to input the mystery number shown on the scale. Then click the tick button.
If you need help, just click on the Help button and one of the missing numbers will be shown. You can keep doing this.
Use the options button to change the range of intervals being shown. You can also choose to work with negative numbers and select between a 1 or 2 player game.
The 2 player game does not allow the use of the Help button.
Use the Go button to start a new game.
See also our Reading Number lines and Guess My Number apps.