Color and Solve Mazes
When you teach children how to make and create their own entertainment and they will never be bored over their entire lifespan, plus they will have learned skills, abilities and confidence in their own capabilities to think for themselves and invent which translates into survival skills for such future challenges as employment opportunities and team building.
Mazes are muticursal patterns, more complex than simple labyrinths, with several paths or branches and dead ends through which the solver must find a route to the destination.
Many of these historic mazes are derived from public domain published in the Project Gutenberg's Amusements in Mathematics, by Henry Ernest Dudeney a 1917 publication. I've re-created these images for entertainment and not necessarily accurately or to scale,