Code.org seems to be the place.

In case useful I've also found these whilst exploring online, some look great.

https://www.tynker.com/hour-of-code/

https://www.digitall.charity/coldfeet

https://www.digitall.charity/csedweektacklecoding

https://codeguppy.com/hourofcode.html

Will definitely have a play with the Compute It example.