Press the right arrow to push the Dummy on the right, left arrow for the one on the left, and up arrow to push the one above you. Press 1 to summon the 1st dummy, 2 to summon the 2nd dummy, and 3 to summon the 3rd dummy. Sorry, I ran out of space for more dummies!
Did you check out Push Master 2.0 yet? https://scratch.mit.edu/projects/435836678/
