# Game rules

The basic rules are very similar to pexeso. Jettons are placed on the playing area with the black and white side on top. The color side of the jettons is facing down and therefore covered. The principle of the game is to find two jettons that are identical on the color side. The game package contains several difficulty variants. These differ mainly in number of jettons used in the game and in playing time. Initially, we recommend playing lighter variants, especially if children are learning the game. Game variants are described below.

Rules in Pdf?

### Game preparation Play video

1. Distribute the cards irregularly on the playing area with the black and white side on top. The random layout of the game map teaches children better orientation and helps them to create coherent thinking.
2. Each player turns over a jetton with number 1 on the top. The numbers on the bottom (color) side of the turned jettons determine the game order. The player with the lowest number plays first and the player with the highest number plays last.
3. If more players happen to uncover the same number on the color side, those players repeat step 2.
4. Players sit around the playing area so that their arrangement corresponds to the game order.
5. The exposed cards are covered again and placed on the same spot.
6. The first player starts!

### Game begins Play video

1. The essence of the game is to find two jettons which are identical on the color side (both the number, color and background matches). So how the game differs from pexeso? Find out below.
2. Each player can turn over one or two jettons during the turn at his/her discretion (strategy). In lower versions we always recommend turn over two jettons.
3. Each player always has only one turn. Thus, it doesn't matter if the player manage to find an identical pair or not. Another player continues.
4. The game continues until all the jettons are collected.
5. At the end, points are counted and the winner is determined. If two or more players get equal points, the game ends in a tie.

### Types of playing jettons Play video

The game pack contains six basic groups of jettons which differ in graphic design and mathematical meaning. Each group has its own procedure according to which players look for identical jettons. The reasons why we have included the groups described below are explained in the additional materials.

#### Multiplication table group

Jettons from this group have a multiplication factor on the black and white side and a multiplication product of these factors on the color side. The color side always contains a number on a gray background.

Example: A player turns over jetton number $5$ and discovers number $10$ on the color side.

$5$ is thus the first multiplication factor with product $10$. The next jetton to be turned is number $2$, the second multiplication factor. In other words $5 \cdot 2 = 10$.

Following this method players find pair jettons from the Miltiplication table group. For the youngest of us who don't know numbers yet, we invented a helpful color ruler, the use of which is explained below.

5
10
2
10

#### Powers group

Power is a special case of multiplication, in which we multiply given number by the same number. Formally, the procedure is the same as for the Multiplication table group. Practically it is even easier.

Jettons from this group always have a base number on the black and white side and a power on the color side. The color side always contains a monochrome number on a circular background.

Example: Example: A player turns over number $3$ and discovers number $9$ on the color side.

$3$ is therefore the base number and 9 is the power. Thus, the next jetton to be turned is also number 3. In other words $3^2 = 9$.

Alternatively, the color ruler can be used as well, although it is not necessary because players always turn over two identical numbers.

3
9.
3
9.

#### Prime number group

Prime number is a number that only has two factors: itself and 1.

Jettons from the prime number group always have the same number on both sides. The color side contains a black number on a yellow background.

Example: A player turns over a jetton with number $5$ and discovers also number $5$ on the color side.

The next jetton to be turned is also number $5$. The player is looking for the black five on yellow background.

5
5
5
5

#### Fibonacci numbers group

Fibonacci numbers are numbers from a sequence, where each subsequent number is the sum of the previous two.

Jettons from the Fibonacci number group always have the same number on the black and white side as on the color side. The color side contains a black number on an orange background.

Example: A player turns over a jetton with number $5$ and discovers also number $5$ on the color side.

The next jetton to be turned is also number $5$. The player is looking for the black five on orange background.

Note that jettons with a given numerical value on the black and white side can belong to more than one group. Only after turning the jetton over can be decided to which one. See example of fives belonging to prime numbers/Fibonacci numbers.

5
5
5
5

#### Factorial group

Factorial is a mathematical operation denoted by an exclamation mark and means that a given number is multiplied by all smaller natural numbers up to one. For example $5! = 5 \cdot 4 \cdot 3 \cdot 2 \cdot 1 = 120$

Hereby we remind that children don't need to know anything we describe here to play Mathesso. All they have to do is orient themselves according to the graphics.

Jettons in the factorial group have either a number or an exclamation mark on the black and white side and the result of the factorial operation on the color side.

Example: A player turns over a jetton with number 5 and discovers number $120$ on the color side.

$5$ is therefore the number to which the factorial operation is applied (little $5!$ on the jetton serves as a hint). As soon as factorial group jetton is recognized, the next jetton to be turned is one of $!$.

Under the jettons with exclamation mark ! only the results of factorial operation are hidden.

5
120
!
120

#### Zero group

Jettons from the zero group always have a number on the black and white side and a zero on the color side. Moreover, there is another translucent number on the color side, which corresponds to the number on the black and white side.

Example: A player turns over a jetton with number $12$ and discovers zero on the color side with translucent $12$ in the background.

The next jetton to be turned is also number $12$.