Rules: Fill the grid with digits 1 to 5 so that each digit appears exactly once in every row and column. Clues outside the grid indicate the sum of digits in the first group until meeting an empty cell.
Background: I have Japanese Puzzle Championship puzzles from 2001 to 2008. So I used so many puzzle ideas from there with giving credit in so many competitions. So *Easy as Japanese Sums is one of them. I’ve added original page (16th JPC – 2007) where I met first time with this puzzle. I made so many of it for different competitions.
* Normally I don’t change the name of any puzzle when I make. However when I decide to use some JPC puzzles, I gave English/Turkish names to some of them if they haven’t any names which I can read. For example, sometimes JPC puzzles had an English names (ie Slash Pack), but this one wasn’t one of them. So I gave the name.
– Edit: As Bram’s comment, this type belongs to Naoki Inaba.