Teaching ladder Crossclimb Level 3: students solve 5 clues before touching order. Answers: DRAT, BRAT, BOAT, BOAS, BOTS. Only then drag rungs until each neighbor differs by exactly one letter.
Middle phase answers: "Phooey!" = DRAT; "Misbehaving child" = BRAT; "Vessel with life vests" = BOAT; "Large constricting snakes" = BOAS; "Chat programs" = BOTS.
Ordering phase: the valid middle chain is DRAT → BRAT → BOAT → BOAS → BOTS. This permutation is the only valid one-letter chain for these answers.
Rule demo: DRAW and DRAT differ in exactly one slot — W→T at the fourth letter (DRAW → DRAT).
Rule demo: DRAT and BRAT differ in exactly one slot — D→B at the first letter (DRAT → BRAT).
Rule demo: BRAT and BOAT differ in exactly one slot — R→O at the second letter (BRAT → BOAT).
Rule demo: BOAT and BOAS differ in exactly one slot — T→S at the fourth letter (BOAT → BOAS).
Rule demo: BOAS and BOTS differ in exactly one slot — A→T at the third letter (BOAS → BOTS).
Rule demo: BOTS and LOTS differ in exactly one slot — B→L at the first letter (BOTS → LOTS).
Lesson complete: DRAW → DRAT → BRAT → BOAT → BOAS → BOTS → LOTS. Remember — middles first, order second, combo last.