Here is a 3 column grid.
In the top left hand corner is a pile of numbers.
Blue 1-5 or red 1-5 or the symbols < = >.
The blue numbers are the first column.
The symbols < = > are in the second column.
Drag ALL BUT ONE of the red numbers into the third column
Using the spare frame move the red numbers around in their column.
*Take care !!! when you drag in your last number the grid becomes FROZEN.
To restart the activity just refresh the page.