When we launched The Word Bee in February 2025, we made a decision that seemed minor at the time: pre-generate every daily puzzle for the next seven years, rather than generating them on-the-fly. That decision has now produced one of the largest publicly available corpora of validated Spelling Bee puzzles: 2,578 puzzles, 18,907 unique words, and 3,743 pangram instances.

This report is a first pass at what that data can tell us about how word puzzles work — which letters dominate, which pangrams recur, and what separates a trivial puzzle from a brutally hard one. The full dataset is available via our GitHub repository. Journalists and researchers, see the press kit at the bottom.

1. Which letters dominate the Spelling Bee?

Each Spelling Bee puzzle uses exactly 7 letters — one center letter (required in every word) and 6 outer letters. Across 2,578 puzzles, the letter I appears most often: it was part of the 7-letter set in 56.4% of all puzzles. The top ten most-common letters (in any position):

The dominance of vowels (I, A, E, U, O) reflects a deliberate constraint in puzzle generation: a pangram needs all 7 letters, and without vowels most English words can't be formed. The center letter (always required) is where the design gets interesting:

The Spelling Bee never gives you easy center letters

Vowels are common in the set of 7 letters, but rare as the center letter. Here's the twist: when a vowel is the center, the puzzle is harder (every word must contain that exact vowel). The distribution is almost inverse to what you might guess:

Consonants dominate the center slot. B, F, and C alone account for 33% of all Spelling Bee puzzles. By contrast, the rarest center letter is X, appearing in just 3 out of 2,578 puzzles (0.1%) — there simply aren't enough common English words that rely on X as a required letter.

Five other letters are also unusually rare as centers: I, N, A, E, and Y, each appearing in fewer than 30 puzzles. Not because they're rare letters — they're extremely common in the general language — but because forcing them as the center produces puzzles with either too few valid words (N) or too many (A, E), which fails the 150–300 point quality gate.

2. Pangrams: the 67/33 split

A pangram is a word that uses all 7 of a puzzle's letters. Every Spelling Bee puzzle has at least one — it's a hard rule in the generator. But there's a striking pattern in how many:

• 67.5% of puzzles have exactly one pangram
• 32.5% have two or more
• The single-puzzle record: 6 pangrams in one grid

More interesting: pangrams are not uniformly distributed across words. Some pangrams are used repeatedly across the corpus — suggesting certain letter combinations are unusually productive:

The reason the H/O/L/I/D/A/Y family dominates: those seven letters combine to make multiple pangrams (HOLIDAY, HYALOID, HYOIDAL), which all share the same 7-letter set. The puzzle generator sees a letter set with multiple pangrams as higher-quality (it gives players more ways to "win") and is more likely to ship it.

Pangram length distribution

While every pangram uses exactly 7 distinct letters, words can reuse letters. Most pangrams are 7 letters (the minimum), but longer pangrams exist:

The longest pangram we've ever generated: QUINQUENNIAL (12 letters), which appeared in the August 19, 2029 puzzle. For reference: there are only 20 twelve-letter pangrams across all 2,578 puzzles — these are statistical rarities.

3. What makes a puzzle hard?

"Difficulty" in Spelling Bee is measured by the Queen Bee score — the total points available if you find every word. Our generator caps this at 300 and floors it at 150, but within that range the variation is substantial:

• Average Queen Bee score: 226.8 points
• Median: 230 points
• Average valid words per puzzle: 51.7
• Median valid words: 52

The hardest puzzle ever generated

The hardest puzzle in our corpus — i.e., the one requiring the most points to reach Queen Bee — is scheduled for October 17, 2026. It has 64 valid words, 300 total points, and the letters N-I-M-B-L-E-R with N as the center.

To put that in perspective: a player scoring 200 points on that day would be classified as "One of a Kind" (solid expert play) but still 100 points short of Queen Bee. The sheer density of valid words — particularly around the N-E-R-B root — is what pushes it to the 300-point ceiling.

The easiest puzzle ever generated

At the other extreme: May 5, 2026, with letters O-V-U-L-A-R-Y and O as the center. Only 35 valid words, 150 total points. The combination of a center vowel and relatively obscure consonants (V, Y) limits the word space severely. A player finding 25 words here is essentially Queen Bee-ing it.

4. Long-tail curiosities

A few oddities surfaced while crunching the numbers:

• SENSUOUSNESSES (14 letters) is the longest word found in any puzzle — it appears in the December 22, 2031 puzzle. It's valid in the Enable dictionary, which matters for tournament-style play.
• QUINQUENNIAL is the only pangram in our corpus that uses the letter Q (which appears in only 37 puzzles as a center, 1.4% of total).
• Some puzzles require the center letter to appear multiple times in a single word. The highest occurrence: NONUNION (uses the center N three times) in the January 1, 2026 puzzle.
• Every single one of the 26 letters of the alphabet has been used as both a center and an outer letter at least once. No letter is unused in any position — though X (3 puzzles) comes close to being absent.

5. What this means for word-game designers

Two practical lessons emerge from the data:

Center-letter distribution drives difficulty more than letter set. The same 6 outer letters with two different centers produce wildly different puzzles. Our generator heavily weights center letters by how many valid words they anchor — which is why B, F, and C dominate.

Multiple pangrams correlate with higher puzzle quality. Puzzles with 2+ pangrams tend to also have more long words (8+ letters), which players find more satisfying to discover. This is why our generator prefers letter sets with multiple pangrams when choosing which puzzle to ship on a given day.

Press kit & citation

Suggested citation:

Embeddable data: The key statistics in this report — letter frequencies, pangram distributions, difficulty metrics — can be freely republished with attribution. For journalists writing listicles about word games, we can provide comparison data against NYT Spelling Bee and other competitors on request.

Try it yourself

Every one of these 2,578 puzzles is playable for free, right now, with no signup. Start with today's Spelling Bee, or use the date selector to jump to any puzzle — including the hardest one (October 17, 2026) once we get there.

We also publish six other daily word games (Wordle, Connections, Crossword, Word Search, Scramble, Wordfall) plus an Anagram Solver. All free, all browser-based, all designed with the same quality-gate approach.

About the author: Shyam Valsan is the founder of The Word Bee. He's an engineer and founder of Netdata (an open-source observability platform). He started The Word Bee in February 2025 after getting frustrated with paywalled, ad-choked word-game sites. Read more about the site →