Yesterday and today groups of 2-3 students had the opportunity to engage in some critical thinking and problem solving with Tangible Play's Doodles app. Each group started out at level 1 and quickly progressed through increasing difficulty. I liked that there wasn't a time limit pressuring them or buzzers going off with a "wrong" answer. The open-ended creativity is a plus. Having students work together really promoted communication and problem solving collaboratively.
Each group had about 10 minutes to play. As an extra challenge I limited them to 1 sheet of paper, which prompted even more critical thinking as they had to work with the lines they had already drawn and shift the paper.