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Red Blocks could refer to four different topics:

  • Undefined Blocksblocks which are not compatible with the running version of Scratch that show up as red blocks saying "Undefined"
  • Script Errors — when a script cannot logically do something (such as dividing by zero) and glows red
  • List Blocks — the blocks for lists, which are color-coded red (h: 18, s: 0.92, v: 0.85 to be precise)
  • My Blocks — blocks involving custom blocks. They are colored a reddish-pink color in Scratch 3.0.