Ripple Effect 8x8 #1 Hard - Hakyuu ("Hakyuu", "Hakyuu Kouka", "Hakyukoka", "Seismic") is a kind of logic puzzle.
The field consists of a rectangular grid divided into sections (rooms); some fields may contain numbers. The goal of the game is to fill all the fields with numbers so that in each room there are numbers from 1 to the number of cells in the section. If a row or column of cells contains two equal numbers, this means that the number of cells between them exceeds or matches these numbers. For example, if a column contains two squares with the number 5, they should be designed with at least 5 squares with other numbers.