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:

ans-0

[Solution to the All Ones puzzle]

[Solution to the All Twos puzzle]

[Solution to the All Threes puzzle]