Find a box and attach a laminated card to it(so you can write and change directions directly on the box). Fill the box with 10 (or a different amount) items. Select a wide range of interesting things - half the fun is seeing what the items are. The students open the box, examine the items and complete the challenge. Write the challenge on the box: building, comparing, creating analogies, ABC order, etc. To differentiate, prepare a box with more (or less) and add three or more steps to the task to make it more challenging.