https://scratch.mit.edu/projects/41488062
https://scratch.mit.edu/projects/212030600
https://scratch.mit.edu/projects/106576469
https://scratch.mit.edu/projects/138045570
Press on the Up key in the keyboard
Observe every project then think about the following questions:
How many sprites did you find?
What type of blocks did the programmer use?
How are the waves triggered?