[tantalor]

I invented this game in 2005, it's called Planarity.

http://planarity.net/

It has a wikipedia page!

https://en.wikipedia.org/wiki/Planarity

Since Flash is dead I rewrote in JavaScript:

http://johntantalo.com/raphael.planarity/

Here's a short doc about how the puzzle generation algorithm works:

http://johntantalo.com/wiki/Planarity/

[crdrost]

Wow, you got cloned by Tatham fast

    Author: Simon Tatham <[e-mail]>
    Date:   Sat Jul 16 19:51:53 2005 +0000

    New puzzle: `Untangle', cloned (with the addition of random grid
    generation) from a simple but rather fun Flash game I saw this
    morning.

How much did you make via PayPal donations back then, if you don't mind my asking?