All Ns Slitherlink

Rules: In addition to regular Slitherlink rules, every cell that could contain an $N$ clue already has one in it. Each value of $N$ from 0 to 3 yields a separate Slitherlink variation.

The example works with $N = 1$ , $N = 2$ , and $N = 3$ .

Example:

[Solution to the All Ones puzzle]

[Solution to the All Twos puzzle]

[Solution to the All Threes puzzle]