Imagine you are at the blue dot and want to visit all red dots once and then come back to your origin.
Routenplaner shows you the order in which you should visit the targets in order :) to travel the shortest possible route.

Help: Drag targets by clicking and moving them with your mouse. Open Menu with M button in left upper corner.

Hotkeys: Open/close [M]enu, increase [N]umber of targets, change ran[D]om movement mode,
increase noise [S]peed (for random mode 2), change [R]oute draw mode. You can do all that also in the menu.