0 sized sprite (this used to be a size of infinity, infinity is automatically set to zero after you reload the page). how to do it: 1. make a new costume for a sprite 2. draw a dot (1 pixel wide) 3. delete the dot 4. the size of the costume should now be 0x0 5. copy (ctrl + c) this: 99999999999999999999 6. paste (ctrl + v) the thing you copied into the size input of the sprite. Repeat until when you click outside of the input the number turns to infinity. 7. reload page