Word puzzles still hold attention if the daily is honest and the campaign is a real ladder, not 2,000 generated boards. Letterfold is a fold-and-find word game: a daily puzzle everyone shares, and 8 packs of 25 handcrafted levels for people who want more than one hit a day.
Wordle clones stall after the daily. Crossword apps stall when the next puzzle is a paywall. We wanted zero install for the daily (web first), a campaign with an actual difficulty curve, and no timer shaming people who think slowly.
Daily is one puzzle, same for everyone, resets midnight local. Campaign is 8 packs × 25 levels. Pack 1 is three-letter folds. Pack 2-3 introduce blockers and locked tiles. Pack 4-5 are themed word lists (kitchen, travel). Pack 6-7 are tight boards with decoy letters. Pack 8 is expert. A wrong fold just undoes - no lives. Hints cost optional coins from dailies, not from failing. PWA wrapper for the store; same save if you started in the browser.
Session: Daily ~3 min; campaign level 2-6 min
People who came for the daily started a pack the same week. That is the conversion we wanted. Instant play means a tweet can be the store page. Campaign means there is a product after the streak.
Pitch the problem - we'll tell you which engine, and how we'd prove the fun first.
Tell us what you're building. We'll reply with a stack pick and a next step.