Paperback (23 Mar 2017)
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Ripple Effect (also known as "Hakyuu", "Hakyuu Kouka", "Hakyukoka", "Seismic") is a logic puzzle published by Nikoli. The puzzle consists of a rectangular grid of any size divided into polyomino sections called "rooms". Each room must be filled with each of the numbers from 1 to the number of cells in the room. If two identical numbers appear in the same row or column, at least that many cells with other numbers must separate them.
| ISBN: | 9781544027517 |
| Publisher: | Createspace Independent Publishing Platform |
| Imprint: | Createspace Independent Publishing Platform |
| Pub date: | 23 Mar 2017 |
| Language: | English |
| Number of pages: | 138 |
| Weight: | 195g |
| Height: | 229mm |
| Width: | 152mm |
| Spine width: | 8mm |
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