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Advanced Scratch

Snap! is a sophisticated version of Scratch (but does not look as good). I recommend it when you are not programming something you want to be “art-like”.

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This resource is not hard! It is a good place to start learning scratch.

Example Projects in Snap!. Look inside the examples and see how they are done. Get inspired and ask questions.
Beauty and Joy of Computing. This is “AP-level Scratch”, a fine level of difficulty if you are interested in programming.
Snap! 5.0 Reference Manual. A book with a lot of details about how to program in Snap, find mistakes in your programs, and work with all of the features of Snap from the “simple” like lists to complicated, like passing blocks as inputs to other blocks. The book starts at the beginning. If you get far enough into it, there are some very deep concepts that you will probably want to ask questions about.