Wait until it is exactly on the hour and watch the cuckoo clocks cuckoo! Alternatively, you can just press the "Test Clocks" button in the bottom left.
I used lots of "if", "and", "or" and time sensing blocks for this project. Feel free to backpack and use in your project! Just remember to credit me! 115+ Blocks "Test Clocks" Button from cooltext.com Art by @RubiksRocker (me), done in the Scratch art editing tool. Background from Pixabay. Updates: 20 Jan 2022 released. 20 Jan 2022 deleted "length of time" sensing. 20 Jan 2022 added "jack in a box". 21 Jan 2022 changed "on the hour" sensing. 21 Jan 2022 fixed 10, 11, 12 bugs. 21 Jan 2022 rewrote and decluttered code. 21 Jan 2022 added "hour logic" variable to tell the clocks how many times to repeat the "cuckoo". 21 Jan 2022 added "egg" . 21 Jan 2022 reshared.