It's called "The Cube" and is the smallest game of mental activation for dogs, with only 6 cm on each side and that's how it works: Put a bite in the slot and it teaches the dog to press the button to get the award, the 'adding more cubes and coloring of different colors, or by plugging the numbers or letters on the button, you can teach the dog to distinguish the differences in name, of course, you must reload "bonuses" just the answer (color, number) exactly. Below is a video demonstration.