CrossMath Grid

Four boxes, four equations, ninety seconds. Make them all true.

What is CrossMath Grid?

CrossMath Grid is a math puzzle built like a tiny crossword. Instead of letters, you place numbers. Instead of clues, you get equations.

The board has four empty boxes and four target results. Two equations run across, two run down. Each empty box sits in one across equation and one down equation at the same time, so every digit you drop has to satisfy two sums at once.

Your job is simple to state and tricky to do. Fill all four boxes with digits 1 through 9 so all four equations come out true. Get one wrong and the grid stays unsolved. The loop is fast: read the targets, test a number, watch the operators turn green, adjust, solve. The puzzle uses addition, subtraction, and multiplication, mixed at random.

How to Play

Everything happens with clicks. No typing, no setup.

1. Read the grid. Each across row and down column ends in a target result, and the operators between the boxes tell you which operation that equation uses.
2. Click an empty box to select it. The selected box glows.
3. Click a digit from the 1-9 drawer to drop it into that box.
4. The game auto-jumps to the next empty box, so you can fill the grid in one smooth run.
5. Watch the operators. When an equation checks out, its operator turns green. That is your live feedback.
6. Place a digit that already sits in another box and it moves over automatically, so you can swap freely while you test ideas.
7. Fill all four boxes correctly and the grid locks in as solved.

Scoring & Rules

CrossMath Grid is pass or fail, and the clock is the pressure. You get 90 seconds to solve the grid. The timer counts down in the top bar and flips to a hurry state with a ticking sound in the final 10 seconds.

There are no points to stack and no combo meter. You either complete the grid or you do not. Solve it and you win: the boxes burst into particles and the screen flashes green. Run out of time and you lose, and the game reveals the correct solution in red.

In a 1v1 duel, an AI opponent works the same grid against you. Its solve speed scales with its ELO rating, and it adapts to how fast you are filling boxes. If the bot completes the grid before you do, the round ends and you lose. First to finish takes it.

Strategy Tips

• Start with the most constrained box. A box feeding a subtraction or multiplication equation usually has fewer valid options, so locking it first narrows everything else.
• Use the green operators as a compass. If three turn green and one stays plain, you only need to rethink the digit feeding that single equation.
• Remember each box answers two equations. Before committing a digit, glance at both the across target and the down target it touches.
• Treat multiplication targets as a shortcut. A result like 12 or 18 limits the pair of digits sharply, which often hands you the rest of the grid.
• Test freely. Placing a digit that is already on the board just clears its old box, so you can rearrange fast without deleting anything by hand.

Skills It Exercises

CrossMath Grid is a fun way to practice mental arithmetic under a little time pressure. You run quick addition, subtraction, and multiplication checks, then hold partial answers in mind while you test how they ripple through the other equations.

Because every digit has to satisfy two equations at once, the game is designed to exercise constraint-based reasoning and working memory. You juggle several conditions at the same time and adjust as new ones lock in. With practice, you may get faster at spotting which numbers fit and at scanning small grids of arithmetic. It is built for a quick, satisfying mental workout you can play in short sessions.

Frequently Asked Questions

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