Minecraft is a game about breaking and placing blocks. At first, people built structures to protect against nocturnal monsters, but as the game grew players worked together to create wonderful, imaginative things.
It can also be about adventuring with friends or watching the sun rise over a blocky ocean. It’s pretty. Brave players battle terrible things in The Nether, which is more scary than pretty. You can also visit a land of mushrooms if it sounds more like your cup of tea.
A stable internet connection is required for Minecraft to download game files, authenticate usernames, and connect to multiplayer servers. You'll need to download and run Minecraft while connected to the internet at least once; afterwards, you can play without an internet connection, but will need to connect if you'd like to receive updates or play online.
Minecraft will not run on a toaster (despite some actually using Java), your car (feel free to prove us wrong, though), Windows RT tablets or a Chromebook.
Information on system requirements for running a Minecraft server can be found on the Minecraft wiki.
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