Here's a quick and deceptively simple game with a bit of strategy mixed in. Students use dice to roll side lengths to try to make all six kinds of triangles (acute, obtuse, right, scalene, isosceles, right). Here's where the strategy and critical thinking come in. Can students make six kinds of triangles in less than six turns? Maybe! If they get some lucky rolls! For example, if a student gets a roll with two of the same numbers, they should make an isosceles or equilateral triangle (depending