Rules: Shade some cells such that every room is filled up starting with one shaded cell, followed by two shaded cells that are adjacent to each other, and so on, until there is no more room to shade n cells in the nth step. When some cells remain to be shaded but cannot be, enter 'x' in those cells, making sure they do not share a border. Shaded cell groups of the same size cannot share a border. Some 'x's may already be given.
About: This puzzle type was invented by Anurag Sahay
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