That's also how I read it; the intended phrase is 'to code only at work'.

I've written a solver that does exactly that here, it prunes positions whose blocks are too far outside the bounding rectangle:

https://gist.github.com/Zimmux/c0fdb3ddad654b6b0ae2

not quite right; some levels like 18 have loops, so some paths have no end state.

Should be fixed now.

The levels with arrows seem PSPACE complete even. I wonder if the levels without arrows are in P.