Objective: be the first calculating fast & correct - placing all required slides on your board forming a completed puzzle - acting by turn - 1 one player acts as question master 2 each player gets a small board with 2 x 4 empty spaces 3 question master draws a hidden slide (bag) with a math multiplication function (within times table) 4 player whose board shows correct answer must reply (if not within a certain time: penalty; wrong: even higher penalty) 5 slide is put properly on the board 6 next slide is drawn... remark: early published game ~ 1900