All you need is a cardboard box, golf tees and marbles. (This post has different ways in which this activity can be played)
Initially, that is the first time we did this activity I pushed the golf tees into the cardboard box and he was balancing the marbles on top of the golf tees. Later, after a few minutes he pulled out all the golf tees and he pushed them into the box and he was rolling the marble between the golf tees- Created his own maze/marble run whatever you want to call it. Add did balancing also.
As he grew older, he started using a hammer, Chintu is more interested in tools and it turned out to be a hit. He started to hammer the golf tees and then balance the marbles. And further improvisation is by using the fine motor tools from learning resources – hammer the golf tees, used a tong/tweezer to balance the marbles and used the same to pull out the golf tees