Crossnum for Beginners: How to Solve Your First Number Crossword

What Is Crossnum?

If you've ever wished Wordle had a brainier cousin, Crossnum is it. Instead of letters, you fill a crossword-style grid with numbers. Each row and column forms a correct arithmetic equation, and every puzzle has exactly one solution. It's free, requires no signup, and a new puzzle drops daily at 2:00 AM — easiest on Monday, hardest on Sunday.

The good news for beginners? You never have to guess. Every answer can be worked out with logic, a little arithmetic, and the constraints built into the puzzle. Here's how to solve your first one.

The Basics: Numbers Instead of Words

A Crossnum grid looks like a crossword, but instead of clues like "a furry animal (3)," you get equations with empty cells. Some cells are already filled in for you. Your job is to fill the rest so that every row and column makes a correct calculation.

For example, a row might read:

1 + 2 + [ ] = 5

That empty cell has to be 2 to make the math work. Simple enough — but as the grid grows, rows and columns overlap, and each number you place helps solve the next equation.

The Number Range: Your Most Important Tool

Before you start, look above the board. You'll see something like:

0..128 or 1..32 or 1..12

That's the range of numbers you're allowed to use in that puzzle. If it says 1..12, every number you write must be between 1 and 12, inclusive. This range is your first filter — it instantly eliminates many possibilities when you're deciding what fits in a cell.

There's also a special rule for multiplication and division: numbers you multiply and divisors cannot exceed 12. So if you're solving a division equation, the divisor is always 12 or less. This keeps the arithmetic manageable and gives you strong constraints to work with.

The Golden Rules: No Fractions, No Negatives

Two rules keep Crossnum clean and solvable:

No fractions — every calculation step must give a whole number.
No negatives — every result must be zero or above.

This means you'll never see a row like 3 ÷ 2 = 1.5. If a division doesn't come out even, that combination is simply wrong. These rules are your friends — they rule out huge numbers of possibilities and point you toward the correct answer.

Step-by-Step: Solving Your First Puzzle

Let's walk through a typical beginner-friendly solve. The exact numbers will vary daily, but the approach stays the same.

Step 1: Read the range. Note the allowed numbers above the board. Keep them in mind for every cell.

Step 2: Find the shortest equation. Look for a row or column with only one empty cell. If the equation is 4 + [ ] = 9, the answer is obviously 5. Fill it in immediately. These single-blank spots are your easiest wins.

Step 3: Use the overlap. Every cell belongs to both a row and a column. Once you fill a cell, it helps solve the perpendicular equation. This is where Crossnum gets satisfying — one answer unlocks the next.

Step 4: Apply the rules to narrow options. Suppose a row has two blanks and reads [ ] × [ ] = 24. With a range of 1..12, the possible pairs are (2,12), (3,8), and (4,6). But if one of those cells is also part of a column that requires a specific number, you can eliminate the others. The no-fractions rule also helps: if a division equation must come out whole, the divisor must divide the dividend evenly.

Step 5: Check your work. When the grid is full, verify every row and column. If all equations balance, you've solved it.

Tips for Beginners

Start with the practice game. Crossnum offers a practice mode before you dive into the daily puzzle. Use it to get comfortable with the mechanics.
Write down the range. Keep the allowed numbers in view — it's easy to forget a limit mid-solve.
Don't guess. If you're stuck, you've missed a constraint. Re-read the range and the golden rules, and look for rows or columns with the fewest blanks.
Play on Mondays. Puzzles get harder as the week progresses, so Monday is the perfect day to build confidence.

Crossnum is a daily mental workout that rewards patience and logic. Once you finish your first grid, you'll see why it's called a crossword — just with numbers instead of words.