Combat Zones for D&D & Pathfinder

I'm a minimalist. Some people call that being lazy. I've recently discovered zone combat terrain for D&D and Pathfinder. See a whole video about it here: Combat Zones For D&D & Pathfinder (Ep. 136) . This is a great idea. I was inspired to make my own using a rule (with holes), a marker, a big sheet of foam board, and an x-acto knife. Total cost is probably less than 10 dollars. Crafting time is 1 minute. See picture below.

Thank you Professor DM!