mit scratch - Is this a bug in Berkley Snap! or am I just missing something? - Stack Overflow
Snap! Build Your Own Blocks
Snap! Build Your Own Blocks
Build Games with Snap! - DataWiz
SNAP! Reference Manual
Snap! Tutorial IIIA2: Custom Blocks with Inputs - YouTube
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Snap! Tutorial IIIA1: Make a block - YouTube
Snap! (programming language) - Wikipedia
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