When the function calls itself, how do you make sure it's not going back to the same place? What if you had a circle of them? That would infinite loop...

*thinks* I guess I could get an array of grid locations and use it like a stack.

Start at 0,1: Store 0,1 in 'stack'
Find next at 1,1: Store 1,1 in 'stack'
Find next at 1,2: Store 1,2 in 'stack'
Find next at 2,2: Store 2,2 in 'stack'
Find next at 2,1: Store 2,1 in 'stack'
Find next at 1,1: 1,1 already exists in 'stack' do not take.

And then when I fall out of an iteration, I can set the most recent location in the 'stack' back to -1,-1. That may be hard to code correctly...

I suppose if I sat down and worked on it, I might find out... but meh. I'll do it later.

What is it they say about silence being golden?