Archive.png This article or section documents something not included in the current version of Scratch (3.0). It is only useful from a historical perspective.
when green flag clicked :: cat
An example of a cat block
A blinking cat block
A cat block when hovered over

A cat block was a type of block added temporarily on March 31, 2020 for April Fools' Day, and removed on April 2, 2020. Cat blocks functioned exactly the same as hat blocks and used the same block palette; however, cat blocks contained a face and cat ears at the base. Hovering the mouse over a cat block would cause the cat block to blink, and hovering over one of the ears would cause it to twitch.


The shape of a cat block is very similar to that of a hat block; however, cat blocks have been modified to resemble a cat with cat ears on the base. All hat blocks were replaced with cat blocks on April 1st 2020, including hat blocks not in Events. For example:

  • when green flag clicked became when green flag clicked :: cat
  • when I start as a clone became when I start as a clone :: cat
  • when ( v) pressed in order :: makeymakey hat became when ( v) pressed in order :: makeymakey cat


The invalid block as a cat block. Images of it were once common in forum signatures.

Although cat blocks were added for merely one day, many users have referenced them in social culture.[1][2][3][4][5][6] Some users have asked the Scratch Team to re-add cat blocks permanently.[7][8][9][10][11][12] However, the Scratch Team officially stated on March 31st that they would not be permanent:

Hi folks! I'm super excited you all are so excited about the cat blocks (we love them too!). This is just for April Fool's Day[sic], so they will not be permanent. Just a fun thing for a few days ^.^ Enjoy them and Scratch On!

– ceebee[13]

Cat blocks have also been added to the block plugin[14] for the Scratch Wiki. They can be used with ::cat.

See Also

External Links