Description from the publisher: What is a triangle? How does a 4 look? What is 5 + 2? The children solve mathematical problems in the tiptoi game "The Hungry Numbers Robot" and feed the hungry Robby! Depending on the level of difficulty they learn to know forms or numbers. For real computing experts, the figure can be expanded to 20. The intelligent tiptoi pen calculates and checks the children's solutions. When the young players solve Robby's tasks correctly, they tap the chip with the tiptoi pencil and place it in Robby's mouth - and he has already disappeared in the belly of the hungry robot. Mjamjam! Whether alone or together, with the tiptoi pen, the children interactively select what they want to do next. If you do not want to count yourself, choose the control symbol for the experience level "Discover", the eye. Then Robby also tells a joke, his belly will be a pocket calculator for the archenemies, and when the children feel like, Robby also sings a song with them.