Crossclimb Level 15 is a 4-letter Crossclimb ladder from MINT to BOAT. Phase one is crossword solving: 5 middle clues yield MIND, MILD, MOLD, BOLD, BOLT. Phase two is ordering; phase three unlocks the combo ends tied by "Fresh deck on a vessel".
Middle phase answers: "Brain or intellect" = MIND; "Not spicy" = MILD; "Fungus growth" = MOLD; "Brave and daring" = BOLD; "Metal fastener" = BOLT.
Ordering phase: the valid middle chain is MIND → MILD → MOLD → BOLD → BOLT. This permutation is the only valid one-letter chain for these answers.
Link MINT → MIND: T→D at the fourth letter (MINT → MIND) (combo-adjacent).
Link MIND → MILD: N→L at the third letter (MIND → MILD).
Link MILD → MOLD: I→O at the second letter (MILD → MOLD).
Link MOLD → BOLD: M→B at the first letter (MOLD → BOLD).
Link BOLD → BOLT: D→T at the fourth letter (BOLD → BOLT).
Link BOLT → BOAT: L→A at the third letter (BOLT → BOAT) (combo-adjacent).
Complete ladder: MINT → MIND → MILD → MOLD → BOLD → BOLT → BOAT. The combo clue "Fresh deck on a vessel" describes both end words together — "MINT" and "BOAT" each differ by one letter from their adjacent middle rungs and satisfy the shared top+bottom prompt. Pattern: unique middle order — Only one middle permutation forms a valid ladder from top to bottom — if ordering feels stuck, recheck a middle answer.