Challenge: Keep the kids busy for 1 hour indoors for $1.
How: With a DIY car track made with a roll of masking tape from the dollar store and some cardboard.
Lena and I had lots of fun making a car race track together with some cardboard, masking tape and random cars and toys that we have around the house. The great part is that you can completely improvise based on whatever materials you have around. Building it was definitely part of the fun!