Sudoku variant of puzzles

[psml-imeji]

Since Kropki Sudoku was famous in many races. It is wise to have Sudoku variant of puzzles like Kropki, Building and Sudoku X. It have already be done by another puzzle type, which is Ichimaga.

[x-sheep]

There are probably hundreds of Sudoku variants out there, and there are other tools which specialize in Sudoku variants, such as F-Puzzles and Cracking The Cryptic's web app.

I'm inclined to not add more Sudoku variants to pzprjs. What do you think?