Well, I need help. I'm making a project and the size of a sprite won't change, even though there's no reason. I have a 50% size block, no other size blocks, and a sprite that stays at 100% size. I have no clue how to fix it.

share your project. The answer is probably in your code

Possibility #1: Your sprite probably already has reached the max size limit
Possibility #2: Your computer is glitching, lagging, broken, or has a bug in it
Possibility #4: Your mouse doesn't work
Possibility #5: Scratch is being weird and is somehow stuck

Solution: Refresh Scratch, restart computer, or make your sprite a little smaller
Solution 2: make a separate costume that is the size of a dot, and switch to that costume. Then, go to the size bar and set the size to 200, e.t.c., then switch back to that costume. This will make the sprite bigger, it's called the “size trick”.

or maybe, the sprite is too small, so do the opposite of solution 2 above.

Alr, i released the project. I don't know why it deoesn't work.

The costume that's selected is too small. Smaller costume = higher size minimum. A fix is to just switch to a different costume that's bigger, change size and switch back.

1. Make the costume
   
   
2. Switch to it then set the size