Marble mazes are a classic puzzle toy. They combine skill, patience and a bit of luck.  Instructables member ChrysN details how she made her marble maze from Dollar Store crafting foam and an old clock case. There’s loads of variations you can do with this concept and you’re sure to keep your friends busy for hours with some very challenging ball drop locations.  [how to make a foam marble maze]

Project estimate:

• Craft foam, on hand or $1
• Glue, on hand
• Craft punch (optional), on hand
• Clock casing (or other suitable box), on hand or $1 and up
• Marbles, on hand or $1