What changes at every step
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Step 1GRAB -> CRAB
Tile 1 changes G to C; the move is sideways by letter shape. CRAB has 8 legal neighbors, 1 shortest continuation, and 4 moves remaining. Other legal exits from GRAB include GRAD, GRAM, GRAY, GRAN.
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Step 2CRAB -> CRAP
Tile 4 changes B to P; the move is closer by letter shape. CRAP has 10 legal neighbors, 1 shortest continuation, and 3 moves remaining. Other legal exits from CRAB include CRAM, CRAY, CRAG, CRAW.
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Step 3CRAP -> CROP
Tile 3 changes A to O; the move is closer by letter shape. CROP has 8 legal neighbors, 2 shortest continuations, and 2 moves remaining. Other legal exits from CRAP include CHAP, CLAP, WRAP, TRAP.
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Step 4CROP -> PROP
Tile 1 changes C to P; the move is closer by letter shape. PROP has 11 legal neighbors, 1 shortest continuation, and 1 move remaining. Other legal exits from CROP include COOP, DROP, CHOP, CLOP.
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Step 5PROP -> POOP
Tile 2 changes R to O; the move is closer by letter shape. POOP has 11 legal neighbors, target reached, and 0 moves remaining. Other legal exits from PROP include PLOP, DROP, PREP, PROS.