This Level 4 Puzzle Requires Your Dog To Complete A Series Of Steps In The Correct Order To Keep Discovering More Hidden Treats! Dog Treat Puzzles Are A Great Way To Reduce Boredom And Provide Mental Enrichment For Your Pup. Between The Moveable Green Tiles, Spinning Wheel, Orange Locks, And Center Sliders, It Is 4 Challenges In 1 Puzzle.For An Extra Challenge, Put The Ridged Orange Locks In Place To Secure The Green Square Tiles.