Teaching ladder Crossclimb Level 18: students solve 5 clues before touching order. Answers: MIND, BIND, BOND, BOLD, BOLT. Only then drag rungs until each neighbor differs by exactly one letter.
Middle phase answers: "Brain or intellect" = MIND; "Tie together" = BIND; "Adhesive or link" = BOND; "Brave and daring" = BOLD; "Metal fastener" = BOLT.
Ordering phase: the valid middle chain is MIND → BIND → BOND → BOLD → BOLT. This permutation is the only valid one-letter chain for these answers.
Rule demo: MILD and MIND differ in exactly one slot — L→N at the third letter (MILD → MIND).
Rule demo: MIND and BIND differ in exactly one slot — M→B at the first letter (MIND → BIND).
Rule demo: BIND and BOND differ in exactly one slot — I→O at the second letter (BIND → BOND).
Rule demo: BOND and BOLD differ in exactly one slot — N→L at the third letter (BOND → BOLD).
Rule demo: BOLD and BOLT differ in exactly one slot — D→T at the fourth letter (BOLD → BOLT).
Rule demo: BOLT and BOOT differ in exactly one slot — L→O at the third letter (BOLT → BOOT).
Lesson complete: MILD → MIND → BIND → BOND → BOLD → BOLT → BOOT. Remember — middles first, order second, combo last.