News/blogposts – Trace skills – Mazes – Grid puzzles – Image Sudoku – Tents themed – Logic math – Logic tabels – Logic grid puzzle

## Logic math puzzles

**KenKen and KenDoku are known names used on a logic puzzle invented in 2004 by Japanese math teacher Tetsuya Miyamoto. The puzzle is a combination of logic and math, and helps training the brain.**

#### Rules

This is the smallest grid in which a logical math puzzle can be solved—a 3×3 grid. The objective is to populate the grid with the numbers 1, 2, and 3, guided by the provided clues.

- Ensure that each row and column contains the numbers 1, 2, and 3 exactly once.
- Avoid repeating the same number within a row or column.
- The small numbers within bigger cells indicate the sum of the numbers in that cell.
- A cell can contain the same number twice as long as it complies with the previously mentioned rules.

### How to play – easy puzzle

**Step 1: **This is how the grid looks with the provided clues. Four cells contain clues, and in two of them, the numbers are given.

**Step 2: **The clues without a + sign behind them tell you what the numbers are. Fill in the numbers that are given in the clues.

**Step 3: **By looking at column one, we know we need the number 3, and since there is already a number 3 in the first row, there is only one possibility: row 2.

**Step 4: **Since we have a number 3 in two of the rows, we can place the number 3 in the last row as well. This row only has one possibility: column 2.

**Step 5: **We can use the clue 4+ in the cell to find the other number. Since we have the number 3, we need to add 1 to get to 4+.

**Step 6: **In columns one and two, we can fill in the missing numbers of 1 and 2 to complete the columns. In rows two and three, we can complete the rows with 2 and 1. The puzzle is solved.

### How to play – harder puzzle

**This puzzle starts without any specified cells. You need to rely on logic to identify potential options.**

**Step 1: **This is the appearance of the grid with the provided clues. There are four cells containing clues, and no initial numbers are given.

**Step 2: **Use the clues to determine the potential placement of each number in its respective spot.

**Step 3: **By looking at the clues and knowing we need to place the numbers 1-2-3 in each column, we can see that in the first column, the number 2 only has one available spot.

**Step 4: **Place the number 2 in the spot. Now, check if this helps us further. It doesn’t help us more.

**Step 5: **If we look at row one, we can see that the number 1 only has one place.

**Step 6: **Place the number 1 in the first column.

**Step 7: **We can also place the number 3 in the last spot in column one. The remaining clues don’t give us any more information. Now, we have to guess and try.

**Step 8:*** ***Alternative one.*** **If the number 2 is in row one**, column two,* it will give us the following solutions for numbers 1 and 3.

**Step 9:*** **If the number 2 is in row one, column two,* it will give us the following solutions for column three. The puzzle is solved.

**Step 10:*** *Let’s check the other alternative. *If the number 3 is in row one, column two,* it will give us the following solutions for numbers one and two.

**Step 9:*** **If the number 3 is in row one, column two*, it will give us the following solutions for column three. The puzzle is solved. This puzzle had two potential solutions.

### My logic math puzzles on Etsy:

Click on the images to be redirected to the corresponding Etsy listing.