You are probably still running around in you fancy pants after yesterday, so lets try something a little less frenetic and more cerebral. Ideal for waking up on a Sunday morning before contemplating fighting your way through traffic to get your holiday gifts.
So what on earth is this?
![vertices vertices](data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20234%20294'%3E%3C/svg%3E)
Click through to find out.
Its a simple puzzle game of rearranging vertices until the net has not crossing edges. Simple yes? Actually it is quite easy, once you have inadvertently invented a large range of topological proofs in your brain. Which people tend to do. No bells and whistles, just the genuine satisfaction of solving a tricky puzzle.
PLANARITY
![planarity planarity](data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20658%20577'%3E%3C/svg%3E)