M-PETS Brainy Games, Einstein Level 3. Level 3 Difficult Include 10 Holes & 18 Movable Slides 29.5 x 29.5 x 5 cm The games come in varying levels of difficulty, ranging from Easy to Expert, and are suitable for all ages, sizes and breeds of dogs. Use these educational games to exercise your pets brain, help improve their instincts and train their sense of smell. Make mealtimes more fun by hiding food inside the game and letting your dog use their nose or paw to move the sliders. Each design has unique mechanisms, combining different holes and movable compartments, that require mental and physical dexterity to overcome challenges and reveal hidden rewards such as food or snacks.Level 3 DIFFICULT Pets have to learn to understand more complex sequential steps in order to access the hidden treats. The problem-solving aspect strongly stimulates their minds and brains.