Done

Done, no green.

ng/ng

go

done

done

start

done

Difficulty score 14. No green.

go

done

go

done, ng

Done.

There's another form of unique rectangle I call the "unique skew." I've seen something like it without realizing it could be exploited. The following form is forbidden, for the same reason as the unique rectangle.
(3,8) ..... ; ..... ..... (3,8) ; ...... ...... ......
(3,8) ..... ; ...... ...... ...... ; ..... ..... (3,8)
...... ..... ; ...... ...... (3,8) ; ..... ..... (3,8)

EZPZ. Brief pauses. 12.

Done