Callisto is a tile-laying game that looks and plays remarkably similar to the hit game Blokus . What’s different? Tiles must touch orthogonally, not diagonally. You have three single piece tiles; place two at the beginning of the game anywhere you want, and place the third anywhere you want later during the game. Use the third piece if you need to start a new field, …

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Callisto, Reiner’s Answer to Blokus