Use 1–9 once each · every sum must work
can you make every sum add up?
№ 1Crossy is a free daily maths puzzle: a little arithmetic crossword. Everyone gets the same 3×3 grid each day, with an operation between each pair of numbers and an answer at the end of every row and column. Your job is to place the digits 1 to 9, each exactly once, so that all six sums are true.
A few digits are already given. Tap an empty square, then tap a digit; the tray greys out digits you've already used, and if you use one twice it's outlined. Each answer box turns solid once its row or column is full and correct. Every line is built so that working left to right and using the usual "times before plus" rule give the same answer, so there's never an argument about order. When every square is filled, press Check: wrong squares are marked with a ✕ so you can fix them and check again. Every puzzle is checked by trying every arrangement of the remaining digits, to make sure exactly one works. Early in the week it's just adding and taking away; later you'll see times and divide, with fewer digits given.
You have six attempts. Solving it on your first check earns 12 points, then 10, 8, 6, 4 and 2 for checks two to six. Each check marks the cells that are wrong. Stuck early on? The helper fills in one correct cell for you, but it halves the day's score and is only available during your first three checks.
Your play streak counts the days in a row you've played, and your solved streak counts the days in a row you've solved the puzzle. Play seven days running and you earn a 7-point bonus, or 14 points if you solved all seven. Miss a day and the streaks start again. A new puzzle arrives every day at midnight UTC.
More puzzles: all Streakly games · how scoring, streaks and badges work