The Challenge Puzzle is not a word search in the ordinary sense. You are not looking for words that are hidden — you are deciding which copy of each word is the right one.
Twenty-five of them appear in Songs of the Sixties, one after every four standard puzzles. This page explains the whole mechanic. If you have the book, the same explanation faces every single Challenge Puzzle, so you never have to come back here.
The rules
- Twenty words, in a numbered chain. Word 1 links to word 2, word 2 to word 3, and so on to word 20.
- Every word is hidden twice. Only one of the two copies belongs to the chain. The other is a decoy — and the decoy is a legal-looking placement, not an obvious throwaway.
- Linked words must share a square. Word 2 has to cross or overlap word 1 somewhere. Touching at a corner is not enough.
- Words read in any of the eight directions, backwards included.
- No more than two words may begin inside the same bold box. The grid is divided into sixteen bold 5×5 boxes. A word “begins” at its first letter.
Exactly one set of twenty choices satisfies all of these at once. Your job is to find it.
Why the box rule matters
This is the rule that turns the puzzle from a search into a deduction. Without it, most of these grids have two valid chains — the box rule is what cuts it to one. That is not a claim; it was measured on every puzzle in the book before it shipped.
In practice it means you will reach a point where two placements both look fine on the chain rule alone, and the only way to break the tie is to count how many words already start in that bold box.
How to actually solve one
- Find both copies of word 1 first. Do not commit. Mark them lightly.
- Look at word 2 from each of them. Often one of the two copies of word 1 has no legal word 2 reaching it at all. That eliminates it immediately, and you have your first real foothold.
- Work forward, not outward. The chain is ordered. Resist the urge to find word 14 early — it will not help you until the words before it are settled.
- Keep a tally per bold box. A light tick in the corner of each box as you commit a starting letter. When a box reaches two, every remaining candidate that starts there is dead.
- Back up one step, not ten. If you hit a contradiction, the wrong choice is almost always the most recent ambiguous one.
What trips people up
Assuming the first copy you find is the right one. It is a coin flip. The decoys are placed deliberately so that they look correct at the depth where you first meet them.
Reading “share a square” as “touch”. Diagonal corner contact is not sharing a square. The words must actually cross or overlap on a letter.
Forgetting that the box rule counts starts, not coverage. A word can run through four boxes. Only the box holding its first letter counts.
Every puzzle has exactly one answer
Each Challenge Puzzle was solved exhaustively by computer before it went into the book. The solver confirms two things: that a full chain exists, and that no second chain satisfies all five rules. A puzzle that failed either test was discarded and rebuilt.
So if you are stuck, you are not stuck on an unfair puzzle. There is a line of reasoning that gets there.