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I have a puzzle idea I call "Minimum Difference". The puzzle looks like a network of connected cells, much like the Sum Thing puzzles already on the site. The goal is to fill all the cells with integers 1 to n, such that the difference between any two connected cells meets or exceeds a specified minimum. A few of the cells in a puzzle will already be filled in.

Sample Puzzle
Code:

 Numbers 1-7
 Minimum Difference = 3
    +-+   +-+
    | |---| |
    +-+   +-+
   /   \ /
 +-+   +-+   +-+
 |5|   | |---| |
 +-+   +-+   +-+
   \   /    /
    +-+   +-+
    | |---| |
    +-+   +-+

I have this and three other puzzles in my sandbox, made using Sum Thing.

Could we have an arrow which indicates that a segment of the loop is visible in a direction, but that segment may or may not be closest. (The white arrow does not do this as it allows nothing to be seen as an option.)

The same thing is happening to me.

I second this idea. I use multiple colors on harder puzzles, usually one color for stuff I know is correct and a second or third color for guesses or conjectures I am trying out. When I hit a dead end, it is a lot of work to either clear everything and re-enter what I know is correct or manually clear all of a specific color.