Controls -Arrows to move logs around. -"x" changes the log length. -"c" rotates the log. -"v" places a log.
All art and coding by me. If it helps you to remember, to change log length use "x", because it's not the right size (meaning you don't want it, "x"). Use "c" to rotate, because it represents a curved arrow. And use "v" to place, because you're placing it d̲o̲w̲n̲.