A complete set of 81 3-edge Maze tiles drawn in oblique projection.

I started with the Wang 3-edge tileset as a 9x9 layout. This was rotated by 90 degrees to allow reflecting tiles along the main diagonal, which halves the work for 'obliquely projected' tiles.

The Wang tiles indicate which walkways are allowed to cross each tile edge:

0) Green grass
1) Brown lower path
2) Lilac upper path

The stage layout shows a random array of 18x12 tiles. All paths should match up across every tile edge. There is no guarantee that all paths are reachable from any point without walking on the grass! 

The steps and path positions produce a regular pattern across the array. Random energy is created as the paths are forced to twist and turn, as both upper and lower paths cannot cross the same tile edge.

There could be a fourth edge denoting both upper and lower paths but this would need 256 tiles. Much energy would be lost. Better to use a 'Twin tileset', or create all tiles procedurally.