I was immediately sucked into it, doing things like devising elaborate tracks for the rider to overcome, building worlds for the rider to explore, and manipulating the rider to perform stunts. I remember when I first discovered Line Rider, that Flash game from 2006 with the simple premise of drawing a track for a sledder to ride on. It's really worth reading in full - here's the beginning: Those latter two fields have a lot of overlap, in a sort of Platonic-forms fashion - the math being the aetherial immortal shapes, and the 80s games, their glitchy and worldly instances. He outlines not only his design decisions - and shows his early sketches - but includes pictures of source material from which he drew inspiration, which included a lot of mathematic forms and low-rez early video games. Lu wrote an equally epic post about his creative process. Watch that video above and you'll see him ride the whole thing. David Lu spent 11 years working on an incredibly epic course for 'Line Rider' - a video game where you draw lines on the screen to create a course for a little character riding a sled.