cal-coola: Brain training game

"cal-coola" challenge :

▷ Work out the exact result, or a close enough one.

▷ The sooner you solve it, the more points you gain.


How to play:

▷ To calculate: Drag tiles into +, -, × & ÷

▷ To undo: Double-tap on the tile

▷ To resolve: Drag your computed tile to the target box