So simple and yet so fun and keeps kids engaged. Makes a great individual or pair activity.

• Take several cardboard tubes. Think: wrapping paper tubes, paper towel tubes & tp tubes
• Cut some in half or thirds lengthwise for the ramps as in photo. (Painting is optional.)
• Cut access holes into the longer sturdier ones.
• Grab some marbles.
• Give the kids the assorted parts and have them put together their own towers.
• Make a game out of who can make thier tower to keep a marble going the longest, fastest, shortest, etc..

pic via pinterest