Number Grid vs KenKen vs Kakuro: What's the Difference?

Number grids, KenKen, and Kakuro all look similar at a glance: a grid, some numbers, a bit of arithmetic. But they're three genuinely different puzzles with different rules, and mixing them up leads to a lot of frustration. If you've ever wondered how a number grid puzzle differs from KenKen or Kakuro, this guide lays them out side by side, explains how each one works, and suggests which to try first. The short version: a number grid is the most beginner-friendly of the three, because it spells out a full equation in every row and column.

The quick comparison

	Number Grid	KenKen	Kakuro
Core idea	Every row and column is a full equation	Latin square split into operation cages	Cross-sums in a crossword shape
Operations	All four (+, −, ×, ÷)	One per cage (+, −, ×, or ÷)	Addition only
"No repeats" rule?	No	Yes (each number once per row/column)	Yes (no repeats within a run)
What you fill in	Missing numbers and operations	Numbers (1 to grid size)	Digits 1–9
Best for beginners?	Yes	Medium	Harder

Now let's look at each one.

Number grid puzzles

A number grid puzzle is the most literal of the three. Every row and every column is written out as an arithmetic equation, like 5 + 3 = 8, with some numbers or operation symbols left blank for you to fill in. You complete the blanks so every equation is correct.

What makes it beginner-friendly:

• The math is on the page. You can see exactly what each row and column should equal, so there's no hidden rule to infer.
• All four operations appear, which makes it great arithmetic practice.
• No "no repeats" constraint, so you focus purely on the equations.
• Equations are read left to right (not PEMDAS), keeping the math predictable.

Because the equations are explicit, number grids are the gentlest on-ramp to arithmetic grid puzzles, ideal for kids and anyone who finds KenKen's hidden rules intimidating.

KenKen (Calcudoku)

KenKen, also known as Calcudoku, combines Sudoku with arithmetic. The grid is a Latin square: in an N×N grid, each row and column must contain the numbers 1 through N exactly once, just like Sudoku. On top of that, the grid is divided into outlined groups of cells called cages, and each cage shows a target number and a single operation (for example, "6×" means the cage's cells must multiply to 6).

So KenKen asks you to satisfy two things at once: the Sudoku-style no-repeats rule and each cage's arithmetic target. That dual constraint makes it more of a logic puzzle than a pure arithmetic one. If you enjoy Sudoku and want math mixed in, KenKen is the sweet spot. Try our KenKen puzzles to feel the difference.

Kakuro

Kakuro looks like a crossword, but the white squares hold digits instead of letters. Each horizontal or vertical run of white cells has a clue number, and the digits in that run must add up to the clue, using only the digits 1 to 9, with no digit repeated within the run.

Kakuro is addition-only, but don't let that fool you, the no-repeats rule and overlapping runs make it a serious deduction challenge. You constantly ask "which combination of different digits sums to this clue, and which of those fit the crossing run?" It's the most crossword-like and, for many, the hardest of the three. Our Kakuro puzzles cover the full range.

So which should you play?

It depends on what you enjoy:

• New to arithmetic grids, or solving with kids? Start with number grid puzzles. The explicit equations make them the easiest to pick up.
• Love Sudoku and want math added? Go for KenKen. The Latin-square logic will feel familiar.
• Want a crossword-style deduction challenge? Try Kakuro. The cross-sums reward combination logic.

A natural progression is number grid → KenKen → Kakuro, each adding a new kind of constraint. Master the explicit equations of a number grid first, then the hidden rules of the others will make more sense.

The common thread

All three reward the same instinct: find the cell or cage that's most constrained, solve it, and let that answer narrow the rest. The difference is where the constraints come from, explicit equations in a number grid, Latin-square-plus-cages in KenKen, no-repeat cross-sums in Kakuro. Once you see them as three flavors of "fill the grid using arithmetic logic," switching between them becomes easy.

Ready to start with the friendliest of the three? Learn the method in how to solve number grid puzzles, then play a grid below.

Frequently asked questions

What is the difference between a number grid and KenKen?

A number grid puzzle spells out a full arithmetic equation in every row and column, and you fill in missing numbers and operations. KenKen is a Latin square (each number appears once per row and column) divided into cages, where each cage has a single target and operation. KenKen adds a no-repeats rule that number grids don't have.

Is Kakuro harder than a number grid?

Generally, yes. Kakuro uses cross-sums with a no-repeated-digits rule, which requires combination logic and deduction across overlapping runs. A number grid shows the full equation for each row and column, making it more direct and beginner-friendly.

Which arithmetic grid puzzle is best for beginners?

Number grid puzzles are the most beginner-friendly because the equations are explicit, there's no hidden Latin-square or no-repeats rule, and the math is read simply left to right. They're a great first step before trying KenKen or Kakuro.