The Noir Painting

The Noir Painting is an Advanced Track. It is obviously a painting on black in white.

Overview
It starts in the lines and dots. Then, on the end, it will go down and go left to the left hill and go to right hill (but you won't see the U-turn of Bloons) and go to the outer ring (again, invinsible U-turn) and then U-turn to the inner ring and go to the shaded part, which is obviously the end.

Placement of Towers
You could only place them at the hills.

Trivia

 * When you see those lines and dots, you think it's Morse code. YES, It is! It says: Invasion 6. It refers to the 6th Bloons War.