To move a disc around, click and drag it.
To flip a disc over, just click it.
Groups of discs
To consider a group of discs, click and drag a brown grouping box around the discs you want. Use the corner handles to adjust the size of the grouping box.
To show/hide the sum of the discs in a group, click the black circle along the top edge of the grouping box.
Flipping all discs in a group
To flip all discs in a group:
- click inside a grouping box to show a triangle marked with a minus sign (if the triangle isn’t already showing)
- click the triangle.