Spiral Stumper Series is a $5$-puzzles series taken from the Final Round of a local (national) contest, KPK, which has been ended recently and authored by me. The theme is spiral and each puzzle is standalone (there will be no meta, etc.)
Ripple Effect (taken from Nikoli)
- The areas divided by bold lines are called "rooms". Fill in all empty cells with numbers under the following rules.
- Each room contains consecutive numbers starting from 1 (to $n$ where $n$ is the area of the room).
- If a number is duplicated in a row or a column, the space between the duplicated numbers must be equal to or larger than the value of the number.