How to play

Every equation across and down has to come out true. Here is everything you need to know.

The board

The board is a crossword made of equations instead of words. Each one runs across or down, like 7 + 5 = 12, and where two equations cross they share a number.

New players get a short tutorial on a Basic board before their first game, and anyone can play it again from the button above.

Some of the numbers are missing. The numbers that belong in those empty boxes wait in the tray under the board.

Placing numbers

Drag a number from the tray onto an empty box, or tap the number and then tap the box.
Changed your mind? Drag a number back off the board, or onto another box.
Multiplication and division are worked out before addition and subtraction, as in any sum: 2 + 3 × 4 = 14.
Any arrangement that makes every equation true solves the board, even one that differs from ours.

Hearts and stars

You have 3 hearts for each board. Completing an equation that does not add up costs a heart, and when the last one is gone the round is over and you can try the board again. Where the game shows ads, a short video can win back one heart instead, once a board (never in a battle).

Solve a board without a single mistake for 3 stars, with one mistake for 2 stars, and with more for 1 star. Play a board again any time to improve its stars and your best time.

Coins and hints

Every board you solve pays one coin for each equation on it.

Stuck? A hint fills an empty box with the right number: the box you picked, or one of the empty ones. You start with 5 hints, and the shop sells more, 3 for 30 coins. Where the game shows ads, the shop also gives a hint for watching a short video, up to 10 a day. Coins and hints are part of the game only: they cannot be bought with money.

Levels

There are 2,700 levels in five difficulties: Lite, Easy, Medium, Hard, Expert. Lite is a gentle start, and each step up asks for more.

New Game opens the next board you have not seen at the difficulty you choose, and Continue takes you back to the last level you played, right where you left it.

The daily challenge

Every day brings one new board, the same one for every player. It starts the week at Medium and climbs to Expert by the weekend.

Missed a day? Any day since you started playing can still be solved later. Solve every day of a month to win that month's trophy.

Solve at least one board a day, a level or the daily, to keep your streak going. Where the game shows ads, a short video can keep a streak you missed a day of, once every 7 days.

Battles

A battle races you against another player's real solve of the same board. You see their progress move as they placed each number, at their own speed.

Fill the board before their run finishes to win. Hints are switched off in a battle, and running out of hearts or leaving the board loses the race.

Your level

Every board you solve earns points toward your player level: one point for each equation, for each star. Clean solves of big boards level you up fastest.

Your Profile keeps the rest of your record: games played, completion and flawless rates, levels solved, your day streak and time played.