Use this in your projects Add to level sprite (or whatever you want this for) and add the custom blocks when the flag is clicked and when the level moves. You can mess around with the values if you like. I used this on my platformer
Remix if you want. Don't have to use credit Griffpatch's tutorial (copy paste) https://www.youtube.com/watch?v=KWZldY-Xtpw You can also use Bob 7432's - https://scratch.mit.edu/projects/1185526428/