cal-coola: Brain training game, by Maths Loops 遊戲
▷ 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