Line 1, 3, and 5 can be move, xpos, ypos, or size; and set their value to the line after it's value. Line 7 is a Boolean, true or false, to repeat the code again after run. Line 8 (optional). If it's value is costume, it will set the costume to line 9's value. (cat-a or cat-b)
Developers: The grey lines change the variable next to them. The red button displays the code as a list (space bar hides that list). The blue button function is in the stage's code.