The Castle Doctrine
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About The Castle Doctrine
The Castle Doctrine is a massively multiplayer game about burglary and home defense, set in 1991. You have a house and family, and other players may try to take what you own. Build security to stop them, study other players’ houses, buy tools and break in to steal their property. Everything you do is permanent.
Build and defend
Design security systems to protect your house from burglars. If an intruder triggers a deadly defense, they can die permanently and lose everything, then start over. You can retreat through the front door to escape from a break-in. There is no randomness, so deaths result from players’ decisions.
Break into homes
You can study other players’ houses, buy tools and attempt to get past their security. A successful burglary permanently destroys and steals another player’s work. Security tapes let you watch what happens during attempted break-ins.
Permanent consequences
The game is turn-based, and its consequences carry over: players can lose their possessions and progress when they die, while their houses can be robbed and damaged by other players. Your actions affect real players, with no protection between them.
Frequently asked questions
The best price for The Castle Doctrine is $3.99 at Steam. It is the only shop with an offer that activates in your country.
The minimum requirements for The Castle Doctrine are: Windows XP, 40 MB RAM, 10 MB storage. It also runs on macOS. The recommended specs are in the System requirements section.
Yes. The Castle Doctrine is multiplayer only. Players on different platforms can play together.
Mostly, yes. Valve rates The Castle Doctrine as Playable on the Steam Deck: it runs, but may need some manual setup.
Yes. The Castle Doctrine is the full base game. You need nothing else to play it.
Steam lets publishers create keys to sell in other shops. Once you activate a key, the game is yours to keep, just like a store purchase.
Disclaimer: CD keys have an inherent 1–2% average failure rate. Check the shop terms for buyer protection info. Steam offers no buyer protection for keys bought in other shops and doesn't refund them.













