table { margin: 1em auto; text-align: center; } td { padding: 0px 0.5em; } img { border: 0px; }

]]> /* Basic Style */ html { background: white; } body { color: black; font-size: 75%; } table { font-family: serif; font-size: 12px; } /* Development Style */ h3 { padding-left: 4em; margin-bottom: 0px; } h3 span { font-size: 1.25em; } div.copy { position: absolute; left: 1em; top: 1em; width: 24em; } div.field { position: absolute; left: 25em; top: 1em; width: 45em; text-align: center; } p.controls { padding-left: 4em; } p.controls input { width: 9em; margin: 0em 0.5em; } p.controls span { margin: 0px 2em; } table { margin: 0px auto; border-collapse: collapse; } td { width: 4em; height: 4em; border-width: 2px; padding: 0px; text-align: center; } td.board_header { vertical-align: center; } td.board_cell { vertical-align: top; } td.active { background: #cfe; } td p { margin: 0px; border: 0px; padding: 0px; } td p.cage_header { height: 1em; text-align: left; } td p.cage_header span { font-family: Verdana; font-weight: bold; font-size: 0.75em; padding-left: 0.5em; } td input.cell_data { background-color: transparent; color: #999; width: 2em; border: 0px; border-bottom: 1px solid #ddd; margin-top: 0.75em; text-align: center; }

How to Play

Use the arrow keys or mouse to select a square.
Use the number keys to fill each square with an integer between 1 and N.
Each integer must appear exactly once in each row and each column.
The groups of squares surrounded by thick black lines are called "cages".
Every cage is labelled with a value, and an optional operator.
The integers within a cage must yield that cage's value when combined (in any order) with that cage's operator.
If no operator is given, the value simply specifies the value of the cage's single square.

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