This is me getting 4180 points on the "I, Z-Bot" level in the original Wonderland game.
I used to have 4150 for ages, having two boxes at the end is pretty misleading. By using only one you can be faster, as seen in this video.
The path I use to take the rainbow coins is slow, but reliable. A faster path would not save any time since there's no way to avoid waiting for the last z-bot at the end.