I think CodeCombat is pretty widely recommended specifically for teaching coding to kids. Not sure if it counts -- it's more coding lessons that are gamified in

I think CodeCombat is pretty widely recommended specifically for teaching coding to kids. Not sure if it counts -- it's more coding lessons that are gamified in overall structure, and also the lessons themselves have gaming aesthetics (e.g. "Write code to move your hero to kill these orcs and open treasure chests"). There's a ton of resources for this area now though, I'm not sure I can point to any one thing as a standard.