the Turbo 3000 was the trickiest to solve i thought it was an alien invasion my husband took 1 look at it and realized it was a the vaccuum and they were all dust bunnies, the snack attack was my favorite i love the color and the layout of the school , the kelp one is the hardest so far with all the colors blending together and looking the same but i love these mysteries and i am so glad i bought these puzzles! thank you