Crossfold: Linked Sudoku

Two boards. One fold. Crossfold is a calm, clever logic puzzle: two 6×6 number grids joined by one shared column. Every amber cell belongs to both boards at once, so a digit you place on the left has to work on the right as well. Solve one side and it quietly opens the other. A NEW FOLD EVERY DAY • A fresh daily puzzle: gentle at the start of the week, hardest on Friday and Saturday • Keep a streak, and earn shields that cover a missed day • Missed one? Every past daily since 1 January 2026 waits in the archive 360 PUZZLES TO MASTER • Easy, Medium and Hard, 120 of each, in sets of 20 • One solution each, built to be solved by logic alone, with no guessing HINTS THAT TEACH • Stuck? A hint first shows where to look, then explains why in one plain sentence, and only then places the digit • Check marks mistakes without giving answers away PLAY YOUR WAY • Classic mode with a timer, or Relaxed mode with the timer and mistake count hidden during play • Notes, undo and redo, and conflict highlighting • Light and dark mode, sounds and haptics, a high-contrast board, and hardware keyboard support SEE YOURSELF IMPROVE • Solve-time trends, a monthly view of your dailies and a count of perfect solves • 16 awards to earn, from First fold to Completionist • Share a spoiler-free card of your solve: colored puzzle squares, with no solution digits PLAY ON IPHONE, IPAD AND IPHONE DUO • Switch between boards on iPhone, or see both together when there is room • Open iPhone Duo like a book for a board on each side • In laptop pose, play with both boards above the fold and the number pad below • Close Duo and continue the same puzzle on the cover screen, with your entries and notes intact NO STRINGS One purchase. No ads, no in-app purchases, no subscriptions and no account. Play offline with locally stored progress and no tracking. Share a result only when you choose.