Online fun addition game with trolls in winter: Whack-a-Troll. With this fun math game you can practice simple mathematical operations: addition and subtraction. In the game settings (cogwheel) you can choose the range of numbers that will have the operations. You can add and subtract up to 10, up to 20 or perform mathematical operations up to 100. You can also select the type of operation you want to study: addition, subtraction or both operations with this fun addition game with trolls in winter.