How We Measured Difficulty#
Every modelled answer form got the same treatment: we walked it through a saved decision tree starting from 52-34=18, and counted guesses until the strategy played the answer or any commutative rearrangement of it — the same win rule Nerdle itself applies; see the official Classic rules. The counts are exact for this saved policy, not an exhaustive proof over every conceivable strategy or a measure of human performance, so "hardest" on this page means hardest for that policy. The methodology page has the dataset and tie-break details.
The Difficulty Distribution#
| Guesses needed | Modelled forms | Share |
|---|---|---|
| 1 | 1 | 0.0% |
| 2 | 2,308 | 13.0% |
| 3 | 13,757 | 77.6% |
| 4 | 1,648 | 9.3% |
| 5 | 9 | 0.1% |
Three guesses dominates for this saved strategy: 77.6% of modelled forms fall in exactly three, and the average is 3.0. Exactly one form takes a single guess — the opener itself. The game allows six; this saved strategy never needs more than 5, and it reaches 5 exactly 9 times in 17,723 verified paths — 0.051% of all modelled forms.
The Saved Strategy's 9 Hardest Answers#
These are the only modelled forms that make the saved strategy work for a fifth guess under real Nerdle rules. Here is the full verified path for each — every equation is playable:
14-7-1=6 — 5 guesses on the verified path
16-6-5=5 — 5 guesses on the verified path
204/3=68 — 5 guesses on the verified path
35+20=55 — 5 guesses on the verified path
44-30=14 — 5 guesses on the verified path
5*2+9=19 — 5 guesses on the verified path
51-10=41 — 5 guesses on the verified path
51-40=11 — 5 guesses on the verified path
57+40=97 — 5 guesses on the verified path
Look at guess four on the first path above, 14-6-7=1 — nearly the answer itself with the digits shuffled. Because subtraction does not commute, a shuffle like that is not a free win under real rules; it has to be played out. That’s the endgame these answers create: by guess three only near-twins remain, and no single equation can tell them all apart. The strategy spends the extra guess splitting the survivors, then finishes.
What Makes an Answer Hard#
Repeated characters are a clue here, but not a signature of hard equations. Across all modelled forms, 81% already contain at least one repeat and the average uses 6.82 distinct characters. The five-guess cases run slightly more repetitive, averaging 6.33 distinct characters, but a handful of cases cannot establish that repetition causes the worst outcomes. A repeated tile can reveal less new information than a new character; how many look-alike candidates remain is what matters on these paths.
Hard answers also live in crowded neighbourhoods. 14-7-1=6 sits among subtraction near-twins — 14-1-6=7 and 14-6-7=1 both appear on its own strategy path — and because subtraction does not commute, each one is a fully distinct answer even under real Nerdle rules. A sum such as 2+8+9=19 is won the moment any reordering of its terms is played, but these subtraction twins must each be played out, so each guess eliminates only a handful of look-alikes. The second-guess guide shows how the strategy splits crowded fields like this early, before they become endgames.
Frequently Asked Questions#
What is the hardest Nerdle answer?
14-7-1=6, 16-6-5=5, 204/3=68, 35+20=55, 44-30=14, 5*2+9=19, 51-10=41, 51-40=11, 57+40=97 are the answer forms that take the full five guesses when starting from 52-34=18 with NerdleBuddy's saved strategy under real Nerdle rules, where a commutative rearrangement of the answer also wins. That is a result for this saved policy, not a claim about every strategy or every player's hardest puzzle.
What does NerdleBuddy's saved strategy average?
The saved strategy averages 3.0 guesses across all 17,723 modelled forms, and 77.6% take exactly 3, counted under real Nerdle rules — a commutative rearrangement of the answer counts as a win. It does not describe average player performance.
Can a Nerdle puzzle be unsolvable in 6 guesses?
NerdleBuddy's saved decision tree solves every one of the 17,723 modelled answer forms in at most 5 guesses when its recommendations are followed, checked under real Nerdle rules across the whole set. That verifies this model and policy; it is not a universal proof about every possible equation or strategy.
Do repeated digits always make equations harder?
No. Repeats can reduce how many new characters a guess tests, but they are also common: 81% of all modelled answer forms contain one. Most of the 5-guess cases contain one too, which is still not enough evidence to call repetition a universal signature of difficulty.
Challenge a friend
Only 9 of 17,723 modelled answer forms push NerdleBuddy's saved strategy to guess five under real Nerdle rules. Try one.
Think You'd Survive Them?
Practise on original NerdleBuddy puzzles, or let the solver show its recommended path move by move.