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Curious Cheetah

Yakuso

Background

This puzzle was developed by Betrand Leplay and first appeared in the French puzzle magazine Multilogic; hence, despite its name, it appears to be of French origin.

Puzzle and Goal

An unsolved puzzle consists of a rectangular grid. Some of the cells in the last row contain sums of the numbers in the same column; some of the other cells contain numbered clues.
The goal is to fill in all but the bottom row according to the rules.

Rules

The solved grid must satisfy the following conditions:

Playable Online