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Fill the Thermometers

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Include separate answer key

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About this template

Fill each tube in an unbroken prefix starting at its round bulb until row and column counts match. A tiny two-cell fill shows the direction and includes the bulb in the count. Empty, partial and full tubes are allowed. Starter uses four-by-four; Growing five-by-five with different tube lengths and turns. Tubes partition the grid without sharing cells, and both original boards have a unique fill pattern. The separate key darkens the filled portions. This is a deduction puzzle, not a temperature-reading lesson.

Suggested ages 7–11 · ordered filling and totals

Activity references

Puzzle Thermometers