It take 30-45 mins to design this activity from scratch.
I used cereal box and chart paper; marker pen and color pencils to design this activity.
Similar type of this activity with different variations has be designed by a lots of instagram mommies and pinterest moms.
Always design an activity in cardboard or chart paper than normal A4 sheets because kids can play in this setup for a while. Better quality of raw materials, long lasting DIY.
I made 12 key cards for my daughter to play – she plays with this 15 – 20 mins.