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Curious Cheetah

Firefly Beam

Background

Firefly Beam is probably a Nikoli original.

Puzzle and Goal

An unsolved puzzle consists of a rectangular grid. Some of the grid intersections contain circles with a dot on one side; some of these contain a numbered clue.
The goal is to connect all of the circles into a connected graph.

Rules

The solved grid must satisfy the following conditions:

Other Names

Hotaru Beam

Playable Online