Express Thru - One line puzzle

Mankind's long-awaited dream to make the universe as their home has became reality! But how? They just did it by figuring out how to process resources from the outer planets.

Now you can contribute as a member of this terraforming project; simply by making path for the robot to deliver those resources!

What you need to do is to draw a path that this robot can load and deliver the specified resources as many times as required. Just remember one thing. You should draw this line at a single stroke, so that you can save your energy to explore other areas!

You will need different resources to build various buildings. Help this robot to carry those resources and complete the mission!


[Features]
- Try find the best route to deliver resources at a single stroke.
- Think wise and use special tiles to delivery resources.
- Use hint to shed a light on your struggle to find the right path; it will be helpful enough to find the way out.
- Bear in mind that some stages are quite challenging to breakthrough. Try beat them up!