Off-line, some blocks are more advanced then others. I think each category should have different sub-categories separated with a line. Each sub-category will have different levels of difficulty blocks. There will be 5 different difficulty types:
Trivial
Easy
Medium
Hard
Expert
Each sub-category will have a title:
Easy Blocks
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This will help new scratchers to have help when they start-up scratch before they click anything.
Offline
that sounds like a bad idea because that is way too many sub categories.
Offline