When you get stuck with a riddle, you can find the answer under "Riddles". Solve the riddle then read Mr. Carfuffle's journal entry about the rare item to continue to a new mini game. You can get hints for riddles if you locate Seymour and click on him after he prompts you. He will highlight the part of the screen where the item is hiding.
This mini-game will earn you extra hints. You cannot access it until completing the first "order". The Jumble Jar mini-game can then be located at the bottom right next to the journal on the bins/order screen. Drag the objects from the jar into the matching boxes. You can only play this mini-games ten times.