I've posted quite a few times to edu-sig about Codesters, an in-browser JavaScript platform (based on Skulpt) that runs a reduced Python, but with added features.  Cool learning environment!

I've just uploaded another teaching Youtube, with a very live-demo flavor i.e. the goal changes slightly as new strategies get adopted.  However, there's measurable progress, as measured by me, the talking head.

My eventual project, which I'm hoping the whole class will engage in (not each working solo, but as a team), puts you in an 8x8 "chessboard" where the arrow keys take you from square to square, and each square is a background image. 

That's a simple framework.  You may then imagine simple games such as Buried Treasure based on this simple infrastructure.  A matrix of hexagon-pentagons on a sphere?  That would be for another classroom and platform. :-D

Codesters does implement the Turtle with penup, pendown, the directional commands, so is in many ways another doorway into Logo-style 2D graphics.  It has a physics engine, with bouncy walls and gravity.  Go crazy!  Fun world!

Again, don't think of Codesters as striving to be a Python3.  It's more Python2 flavored and is a stepping stone, an instructive environment. 

Here in the education sphere, we get to deal with (and even design) such things. :-D  Many of us here have been trailblazers, still are.  Yay us!

Kirby