The first background project I completed was When Fortunes' Collide which basically is a game that you need to get gifts while being chased by ghost while controlling a shark.
Link to my project: https://scratch.mit.edu/projects/1223320382
The second background project I completed was the Rock, Paper, Scissors game where if you press 1 it is completely random and if you press 2 you get control one of the people.
Link to my project: https://scratch.mit.edu/projects/1232283923
The third background project was Guess my Number. In this project we were taught about the binary search. The binary search is where you guess half of the range then repeat this process until you get the answer. You do this in scratch by if they say higher or lower you set the respective maximum or minimum to that to change the range for the computer.
Link to my Project: https://scratch.mit.edu/projects/1244529316