“Screeps” is a wordplay for “scripts” and “creeps.” It is an MMO RTS game for programmers in an open persistent shared world. Each player uses JavaScript (or compilers of other languages into JavaScript) to write AI of his or her colony of units (“creeps”) which live and operate in real time even while the player is offline. The game world is generated procedurally and consists of rooms. Players compete for controlling these rooms by mining resources, developing infrastructure, and commanding armies.

Screeps can also be called a sandbox game for programmers since it has no definite goals. Instead, it offers players a fully programmable game world, means to interact with each other within it, and JavaScript API to control game objects. This allows for many possible outcomes for each player and an open-ended nature of the game.

It is an open source MMO RTS sandbox game for programming enthusiasts, wherein the core mechanic is. With all the attributes of a full-fledged strategy game, you control your colony by writingwhich operates 24/7 in the single persistent world filled by other players on par with you.
Your colony canresources,units,territory,with other colonies. As you conquer more territory, your influence in the game world grows, as well as your abilities to expand your footprint. But beware, multiple players aiming for the same territory may lead to conflict!
Screeps is developed for people with programming skills. Unlike some other RTS games, your units in Screeps can react to events without your participation – provided that you have programmed them properly. And, unlike other MMO, you do not have to play Screeps constantly to play well. It is quite enough just to check once in a while to see if everything goes well.

Screeps Key Features:
1, You play by writing JavaScript AI which controls your units 24/7 even while you’re offline.
2, Units of all players coexist in the same real-time huge persistent world and obey the same rules.
3, Many kinds of units, base building, mining resources, territory control, economy, manufacturing, transporting, logistics, trading—all the attributes of a real strategy game which you need to program!
4, The better your scripts, the better your game—irrespective of the time played. Your creeps will mine, build, defend, and conquer as you just work, sleep, or walk your dog.
5, Only basic programming skills are required. However, if you are a pro developer, now is the chance to put your skills to the limit!
6, Edit your scripts from the in-game editor, or using your favorite external IDE.
7, Permanent MMO access with 20 CPU limit included in the starter package. Unlock your full CPU in your account on the official server by purchasing a CPU subscription plan or via in-game items called