To teach people the basics of the game, a Happy Wheels demo with a few levels and the Level Editor (where the playtesting feature is broken) was made and uploaded to multiple platforms, like Newgrounds, Kongregate and Mochi Games. Most versions of the demo are v1.10, one version including the level Happy Green Hills, but there was also a demo that used v1.52, which included new levels such as Obst. Course (not to be confused with jim bonacci's "Obstacle Course?") and Speed Bridge. Unfortunately, this demo was not used on much websites, and these websites that included the v1.52 demo may be dead by now. This has made the demo obsolete, and it is unable to be found anywhere. The only channel that included a video of the demo was GoGy games, which can be viewed here. If you ask them for it, they will say something unhelpful like "Why don't you try 3d racing games", and i'm pretty sure they don't HAVE the file at all
(if you're thinking a subject like this is NSFL, happy wheels isn't really that bloody and a handful of kid-friendly channels like DanTDM and Annoying Orange have played it... multiple times)