Push into one of the statues till it budges. The statues belong on these spots while also staring in direction of the center statue. Notice that from their direct line of vision, the floor has slightly discolored squares. ANSWER- From the smaller statues' starting position, they are staring at walls. They're staring away from the red soul, not at it like they should. The jewel is red, the two smaller statues must be these other gods mentioned. The existing result that the pushing-blocks puzzle Sokoban is PSPACE-complete,īy showing that it is PSPACE-complete even if no barriers are allowed.-HINT- It speaks of a god of sun and moon whom's gaze is needed to release red soul. PSPACE-complete, of which we also give a simpler proof. Strengthening of the existing result that the restricted Rush Hour puzzles are No priorĬomplexity results were known about these puzzles. (1x2 blocks) and the goal is simply to move a particular piece. Puzzles are PSPACE-hard, even if the pieces are restricted to be all dominoes Main result along these lines is that classic unrestricted sliding-block Reductions to show that several motion-planning problems are PSPACE-hard. We illustrate the importance of our model of computation by giving simple Rush Hour Logic'' developed by Flake and Baum. Our framework is inspired by (and indeed a generalization of) the ``Generalized Of special cases including planar graphs and highly restricted vertexĬonfigurations, some of which correspond to a kind of passive constraint logic. To reverse the direction of a particular edge is shown to be PSPACE-complete byĪ reduction from Quantified Boolean Formulas. Deciding whether this simple graph model can be manipulated in order Demaine Download PDF Abstract: We present a nondeterministic model of computation based on reversing edgeĭirections in weighted directed graphs with minimum in-flow constraints on Download a PDF of the paper titled PSPACE-Completeness of Sliding-Block Puzzles and Other Problems through the Nondeterministic Constraint Logic Model of Computation, by Robert A.
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