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Curious Cheetah

Zahlenschlange

Background

Janko.at attributes this puzzle to Leonid Mochalov.

Puzzle and Goal

An unsolved puzzle consists of a rectangular grid filled with numbers.
The goal is to draw a single line through orthogonally neighboring cells, starting at the upper left and ending at the lower right.
This is basically a maze using numbers; the name translates to "integer snake".

Rules

The solved grid must satisfy the following conditions:

Playable Online