Shelter Zero is an action game in which you control the game character that can attack the monsters in the level. You can take part in the game via a local network (LAN), as well as online. You can choose to play with real players online, or with random players.

You can also take part in competitive matches, which are in turn divided into offline and online ones. The offline matches are held by bots, which means that the game will be played by AI. You can find a number of online opponents who are also human players.

Shelter Zero is a free offline game. 

In offline matches, there is no need to wait for other players to join the match. Once the game has started, you can join the current match and play against opponents online.

Offline matches are divided into two parts: the normal mode and the advanced mode. The first allows you to choose the character, the level of difficulty, the map, and the difficulty of the opponent. In the advanced mode, you can customize the difficulty and map settings and the number of players.

In offline matches, you will need to take part in missions, which are divided into five sections: beginner, basic, intermediate, advanced, and expert. In each section, you can choose the difficulty of the opponent and the mode of the game.