# Common Thread Sixteen words on the grid share four hidden Common Threads — spot the grouping, pick four tiles and lock in. 40 hand-built puzzles escalate from plain categories to overlap traps where one word seems to belong to two groups at once; four lives per puzzle, one-away hints, star ratings and a level map that saves your progress on this device. Facts: Medium, ~10 min, desktop + mobile — controls: Tap words to select up to four, then press Submit. A correct set locks in and reveals its thread label; a wrong guess costs one of four lives, and the game tells you when you are one away. Clear all four groups to win the puzzle. ## What kind of game Common Thread is Common Thread is a word-grouping puzzle built in-house for this catalog: sixteen words sit on the grid, four hidden categories run through them, and your whole job is to spot which four words share a thread and lock them in as a set. The catalog files it under word and brain games, rates it Medium, and estimates sessions around ten minutes — enough for several puzzles, since the set ships with forty hand-built levels rather than an endless generator. Being hand-built is the detail that gives it character. Generated grouping puzzles drift toward dictionary-trivia sameness; authored ones have personality — the escalation the summary promises runs from plain categories early on to overlap traps, where one word plausibly belongs to two groups and only one grouping leaves the rest of the board solvable. That overlap is where the Medium rating lives: not harder words, just meaner neighbors. ## How to play, step by step The control is tap-and-submit: tap words to select up to four, press Submit, and a correct set locks in and reveals its thread label. A wrong guess costs one of four lives, and the game tells you when a selection was close — which turns each mistake into information rather than just damage. Clear all four threads and the puzzle is done; run out of lives and the board tells you what you missed. The solving method mirrors every great grouping puzzle: solve the most concrete thread first. Obvious pairs — two words that clearly share a category — are anchors, but the discipline is resisting the urge to submit a pair-based guess before you can name the category out loud. If you can say why four words group together, submit; if you only feel that they do, hold — especially late in the board, where the overlap trap is usually waiting with a decoy category that fits three of your four. ## Overlap traps and the art of the held guess The overlap trap deserves respect because it is the puzzle's signature move. A word like, say, a term that fits both a music category and a cooking category will sit there validly in either — and the board is designed so the wrong placement strands an orphan set with no thread left. The counter-intuition: when two categories seem to compete for the same words, solve the OTHER two threads first. Clearing the uncontested groups reveals which reading of the contested words the puzzle actually wants. The four lives are a budget, not a countdown, and the ten-minute session estimate absorbs a few deliberate spends. A life spent testing a named theory early is cheap tuition; a life spent on a vibe with three puzzles left is the expensive kind. Players who treat guesses as experiments with stated hypotheses — I think these four are X — improve across the forty levels twice as fast as players who tap on hope. One last reading order worth naming: scan for the oddball before the category. Every hand-built board has a word or two that only fits ONE thread no matter how you squint, and locking those anchors early turns the remaining twelve words into a much smaller problem — the puzzle quietly becomes eight words in two categories, which is a different and friendlier game than sixteen in four. ## Difficulty, sessions and devices The Medium rating tracks the trap design and the category abstraction, not the interface — tapping four words and submitting is the entire control surface, on desktop or mobile. Ten minutes covers a comfortable run of puzzles from the forty-level set, and being hand-authored means the difficulty curve was placed, not rolled. It runs free in the browser with no download and no account. If the format clicks, the word games collection holds the wider family and the brain-games shelf the daily-habit cousins. The one-line takeaway for Common Thread: name the thread before you spend the tap — and when two threads fight over one word, clear the room around them first. ## Frequently asked questions ### How do you play Common Thread? Sixteen words, four hidden categories: tap words to select up to four and press Submit. A correct set locks in and reveals its thread; a wrong guess costs one of four lives. Solve all four threads to finish the puzzle. ### How many levels does Common Thread have? Forty hand-built puzzles, escalating from plain categories to overlap traps where one word plausibly fits two groups. Being hand-authored, the difficulty curve is designed rather than generated — the traps arrive exactly when the easy habits start working. ### Is Common Thread free to play? Yes — it runs free in the browser with no download and no account, on desktop and mobile, with tap-to-select controls only. ### What should I do when two categories seem to fit the same words? Solve the other two threads first. Clearing the uncontested groups reveals which reading the puzzle wants for the contested words. And only submit when you can name the category out loud — a guess with a stated reason costs a life; a guess on a vibe costs the game.