From Test-Scratch-Wiki
Scratch Cards are cards that are used to teach Scratchers how to program in Scratch. These cards are quite useful; instead of needing to have a computer to learn Scratch, users can quickly learn how to program in Scratch, no matter where they are. Scratch cards can also be used for reference. They were updated to Scratch 2.0 with all-new cards on February 13, 2014.
Because of their portability and simplicity, Scratch Cards are ideal to be used when Scratchers first start learning Scratch, and are great for Scratch clubs and classes.
