What changes at every step
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Step 1SNAG -> SNAP
Tile 4 changes G to P; the move is closer by letter shape. SNAP has 6 legal neighbors, 1 shortest continuation, and 4 moves remaining. Other legal exits from SNAG include SLAG, SNOG, STAG, SNUG.
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Step 2SNAP -> SLAP
Tile 2 changes N to L; the move is sideways by letter shape. SLAP has 14 legal neighbors, 2 shortest continuations, and 3 moves remaining. Other legal exits from SNAP include SOAP, SWAP, SNIP, KNAP.
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Step 3SLAP -> SLOP
Tile 3 changes A to O; the move is closer by letter shape. SLOP has 13 legal neighbors, 1 shortest continuation, and 2 moves remaining. Other legal exits from SLAP include PLAP, SLIP, FLAP, CLAP.
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Step 4SLOP -> PLOP
Tile 1 changes S to P; the move is closer by letter shape. PLOP has 11 legal neighbors, 1 shortest continuation, and 1 move remaining. Other legal exits from SLOP include FLOP, CLOP, GLOP, SHOP.
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Step 5PLOP -> POOP
Tile 2 changes L to O; the move is closer by letter shape. POOP has 11 legal neighbors, target reached, and 0 moves remaining. Other legal exits from PLOP include PROP, PLOT, FLOP, PLOW.