Puzzle 181 (Endless Labyrinth)

This is a Wednesday Endless Labyrinth puzzle.

Puzzle 181

Puzzle 157 (Endless Labyrinth)

This is a Sunday Endless Labyrinth puzzle

Puzzle 157

There are two ways of doing this one: finding the intended insight, or many successive uses of trial and error (albeit of relatively low depth).

Puzzle 146 (Endless Labyrinth)

This is a Thursday Endless Labyrinth puzzle.

Puzzle 146

Note that I made a change to the rules of this puzzle: going through all cells in the grid is no longer required, although you do need to pass through all cells with a number or color.

Puzzle 139 (Endless Labyrinth)

This is a Thursday Endless Labyrinth puzzle.
Note that the rules of the puzzle have changed since this first one was posted. In this puzzle you will need to assume the loop goes through all cells in the grid, a restriction that does not apply to later puzzles of this type.

Puzzle 139

The toroidal grid rule made it a little tough to make an easy puzzle for this, so I’ll settle for making its debut a Thursday.