Roman
Veteran
bestsiteever.ru/ro

The puzzle is quite similar to 15 puzzle except for "parities" (situation when you need to swap just 2 pcs) for which I haven't found any optimal way to solve yet.
Ro comes from "Rotation" - 4 tiles rotate around the common point. I will add more "rules", such as "Di" (2 pairs of tiles are switched diagonally) and other surprising ones.

The puzzle is quite similar to 15 puzzle except for "parities" (situation when you need to swap just 2 pcs) for which I haven't found any optimal way to solve yet.
Ro comes from "Rotation" - 4 tiles rotate around the common point. I will add more "rules", such as "Di" (2 pairs of tiles are switched diagonally) and other surprising ones.
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