If you need to modify any of the existing games / or game content in Futaba Classroom Games, it’s very easy to do.

Under settings, go to “Game Content”, and then scroll to the bottom of the page to the “Create a new game” button. Tapping this button will allow you to create new games sets, or modify the existing content.

So if your students aren’t used to working with negative numbers, you can easily turn these options off by using the toggle for each game item: