Quadlevel 3D Chess - https://www.chess3d.com  
QuadLevel extends the noble tradition of chess onto four stacked boards. Familiar pieces gain new dimensions of movement, creating elegant tactics of height, depth, and timing while preserving the spirit of the classical game.   QuadLevel uses four half‑boards stacked vertically (4×8×4), with two full sets of chessmen.  
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Solve Mate In 2 Puzzles! Since there are two Kings for each side, many are dual checks, royal forks,     or situations where  the ending mate is either one King or the other depending on which defense move is chosen.

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