Classification target LinkedIn Crossclimb #914. Ladder width: 4. Middle samples: POLE, PILE, FILE, FILL, BILL. Combo label: "A two-word phrase for a sphere for catching creatures in a massively popular game series.". Full chain: POKE → POLE → PILE → FILE → FILL → BILL → BALL.
Middle phase answers: "What a gondolier uses for propulsion" = POLE; "Heap" = PILE; "You might use it on your nails" = FILE; "___-in-the-blank" = FILL; "What someone must pay before leaving the restaurant" = BILL.
Ordering phase: the valid middle chain is POLE → PILE → FILE → FILL → BILL. This permutation is the only valid one-letter chain for these answers.
Transition 1: K→L at the third letter (POKE → POLE).
Transition 2: O→I at the second letter (POLE → PILE).
Transition 3: P→F at the first letter (PILE → FILE).
Transition 4: E→L at the fourth letter (FILE → FILL).
Transition 5: F→B at the first letter (FILL → BILL).
Transition 6: I→A at the second letter (BILL → BALL).
Ladder result: POKE → POLE → PILE → FILE → FILL → BILL → BALL. Classification: unique middle order.