# World Mechanics

### Grid system

In order for multiple game instances to be running concurrently TetrisFriends makes use of a custom grid based system which spins up new instances on demand. Take a look at the image below:

![](/files/-Ly_xiih56BVPMdttbm-)

It first tries to start a game in the cell in the upper right corner. If that is not possible it proceeds to the next cell and checks. It will continue to do so until it finds a free cell. If it reaches the end of the red arrow it will try in the 16 cells in the next ring and then the 24 cells in the third ring and so on.

### Note on performance

The plugin has a "warm-up" related to the cells. Each cell contains a copy of the selected schematic in the default case each cell has a large arcade machine. When a schematic is pasted it'll spike the server shortly, however, the schematic is only pasted once in each cell. Here's an example:

The plugin has been installed and one player is playing in the first cell where the schematic has been pasted. A second player starts a game which results in a schematic being pasted in the second cell spiking the server shortly. Now both players are done playing and two new players want to play. A schematic has been pasted in the first two cells so there is no need for a schematic to be pasted again thus no spike.

{% hint style="info" %}
You can skip the "warm-up" with the pregeneration command found [here](https://tetrisfriends.benzoft.com/commands-and-permissions#admin-commands-tetrisfriendsadmin).
{% endhint %}


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