> I'm sorry to say that NewGround Jam period is too short for a semester, and too early for the semester after summer vacation. Since you put the words so firmly like, me and my colleagues can see Scirra's determination clearly. We are sorry to say that we won't invest on C3 education programs, and we will help our customer schools to migrate to other 2D engines in order to avoid the termination of C2.
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Older engines never had layers. They are just a convenience.
You can make 1000s of layers on one layer using the engine z stacking or even have your own dynamic z sorting in 2 events ....but I suppose you prefer to teach your students defeatism instead of ingenuity.
Everything in the class is for convenient comparing using DirectX or OpenGL to make a game. Of course, I can teach student how to make a engine from a blank file, and compile it to get a native binary.