Open Track (Game Mechanic)

is a type of Tracks, which provides a wide place for both Tower and Bloons. Towers will take a specific, rectangular area from the track, and Bloons will find the shortest way to reach the exit, regardless of towers nearby.

Tower Placement
To make stuff less as arbitrary, Towers are automatically snapped into grids when placed. Obviously, Tower Overlapping is not allowed, and since this system of placements is calculated as grids, the tower may be more sparse-looking, with a Metal-plate under it to further show its occupying area.

Road items, or Towers that can move around spaces, can still be placed, they will not occupy any space and thus will not block bloons, so that they can be freely passed through.

Towers whose base are just some flat area, or in other words flying towers like Monkey Ace, does not block bloons from passing through. However, they still take up space and overlapping is not possible.

Blocking is generally not allowed, as Bloons cannot get a way to exit and is unfair.

Bloons Movement
The Bloons may escape in the thinnest gap, regardless of its size, and flying enemies can freely go past towers. This is done to prevent complex sizes of bloons from affecting or being partially blocked by the towers.

Trivia

 * Told you I should, now I need to make this whole thing for making new tracks.