What changes at every step
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Step 1SODA -> SOMA
Tile 3 changes D to M; the move is sideways by letter shape. SOMA has 5 legal neighbors, 2 shortest continuations, and 4 moves remaining. Other legal exits from SODA include CODA, SODS, SOFA, SOBA.
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Step 2SOMA -> COMA
Tile 1 changes S to C; the move is sideways by letter shape. COMA has 7 legal neighbors, 1 shortest continuation, and 3 moves remaining. Other legal exits from SOMA include SOME, SOFA, SOBA.
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Step 3COMA -> COMP
Tile 4 changes A to P; the move is closer by letter shape. COMP has 8 legal neighbors, 2 shortest continuations, and 2 moves remaining. Other legal exits from COMA include COME, COMB, COLA, COCA.
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Step 4COMP -> COOP
Tile 3 changes M to O; the move is closer by letter shape. COOP has 14 legal neighbors, 1 shortest continuation, and 1 move remaining. Other legal exits from COMP include POMP, COUP, ROMP, COME.
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Step 5COOP -> POOP
Tile 1 changes C to P; the move is closer by letter shape. POOP has 11 legal neighbors, target reached, and 0 moves remaining. Other legal exits from COOP include LOOP, HOOP, BOOP, GOOP.