# Basic rules

## The Basic Concept Behind All Arithmo Puzzles

All Arithmo puzzles use the basic mathematics functions: addition, subtraction, multiplication, and division; with or without the use of parentheses. Welcome to mathematical heaven!

It’s very easy to play, and catchy once you’ve begun. There are one to two different main concepts behind all Arithmo puzzles. One is to find 3 numbers on a grid, ranging from 1 to 12, so that they match some math equation. The other is to place numbers on a grid to create a special sequence of 3 “connected” numbers, which gives a result ranging from 13 to 24 (in some games can be 1-24). Both of these use only the basic mathematics functions. All of this is much easier than it sounds!

That "math equation" we mentioned in the last paragraph, made from "3 connected numbers", is called Equa. Equa-X is a term we use which means "the equation that makes result X." For example, "Equa-17" is the equation of 3 numbers that are connected on the grid, which together can make 17 if you add, subtract, multiply, or divide them together in any order or combination.

Equas examples:

 8x12:6 = 16 (Equa-16) (8-5)x7 = 21 (Equa-21) 6x3+5 = 23 (Equa-23)

There are three different ways of "connecting" numbers in every single Arithmo game. Remember that "connecting" in Arithmo games always means numbers that are adjacent to one another on the grid.

The first way is a "straight" connection, where numbers are connected horizontally (all in the same row, as shown in picture 1), or vertically (all in the same column, as shown in picture 2). The second way is an "L" shaped variant, where connected numbers are not all in same row or same column, but they create an "L" in the grid (as shown in picture 3).

8 x 12 : 6 = 16
Picture 1: Equa-16 (horizontal)

(8 - 5) x 7 = 21
Picture 2: Equa-21 (vertical)

6 x 3 + 5 = 23
Picture 3: Equa-23 (L-shaped)

The third way is the "triangle" connection, called Equa-T. This is when hexagons or rhombuses are being connected into a “T” shape (as shown in pictures 4 and 5).

Picture 4: Sample of T-Shape (hexagons)

Picture 5: Sample of T-Shape (rhombuses)

The last ways are connections in circular or triangular puzzles but we consider them as a straight connections since they act as linear connection (as shown in pictures 6 and 7).

Picture 6: Sample of straight connection in triangular puzzle

Picture 7: Sample of straight connection in circular puzzle

Grid size can vary from game to game, depending on different skill levels. The smallest grid size would be 2x2. The biggest would be 9x9.

Arithmo puzzles are so simple to play, it’s a wonder that they’re so addictive! Players compete against themselves, friends or the clock to score points and solve brainteasers.

## As long as you know these basics, you’re set to play any Arithmo game!

So remember:

• An Equa-X, Equa, or Equation all mean the same thing in Arithmo. They always mean "any set of 3 connected/ adjacent numbers that equal some product when you add, subtract, multiply, or divide them together in any order or combination."
• In the Arithmo world, "Connected Numbers" always means "three numbers that are adjacent (next to each other) on the grid, so that you can connect them using a straight vertical or horizontal line, or an 'L' shaped line." You can’t just use random numbers from different places on the grid. It must always be three directly connected numbers.
• Your goal is different in each puzzle, but usually it’s finding three connected numbers that equal a certain product, or figuring out which product can not be found on the grid.