Day
Build
Spend your gold wisely. Raise new buildings, place them where you want on the map and decide who each gate is open to. Every open gate is an opportunity, and a risk.
A strategy game you play in your browser
Build your castle by day. Defend it by night.
A pixel-art castle adventure set some 2,000 years ago. Build your own castle, run its market, strengthen your defences and face new threats every night. But this is no ordinary castle: every building you raise stands for a piece of real-world internet infrastructure.
We're in closed beta. Accounts are invite-only for now. If you have an invite, you can start right away. The game is in Turkish only.
Ages 13+ · Free · Plays in your browser
castle
Build by day. Defend by night. Make sense of it by morning.
Time never stops in your castle. Every day has three phases, and every choice shapes the night that follows.
Night
Defend
Visitors come to your market, but not all of them came to shop. You can't know when attackers will show up, but you decide how your defences work. Strangers can't pass a closed gate. The richer your treasury, the more attention your castle draws.
Morning
Read the report
See what happened overnight. Where your watchtower is looking, you learn not only what happened but why. Where no one was watching, you only see the outcome.
Infrastructure
One castle. Two worlds.
Every building in the game has a counterpart in real internet infrastructure. The castle view tells everything as a story. Switch to the infrastructure view and you see the same buildings by their technical names: what each one does, its current state and a sample real-world configuration. In castle you don't just build a castle; you see how a system fits together.
| In the castle | In the real world |
|---|---|
| Market | Web server |
| Granary | Database |
| Walls | Firewall |
| Gates | Network ports (80, 22, 5432, 443) |
| Watchtower | Monitoring |
| Gatekeeper | Load balancer |
| Seal house | TLS certificate |
| Scribe and remote vault | Backup |
castle is a game; the technical configurations shown are examples.
Strategy
27 days. 5 chapters. One castle.
Each chapter puts your castle to a new test. At the end of days 3, 7, 15, 21 and 27 your decisions are reviewed and you earn up to three stars. Every star comes with a reason, so you see what you got right and where you went wrong. If your castle falls, you can replay that day or night.
Chapter I · Days 1–3
Founding
Everything needs a foundation. Set up your market, prepare your granary, raise your walls and open your first gates.
Chapter II · Days 4–7
Keys and seals
Not every gate opens for everyone. Manage the maintenance key, control who the merchants can reach and build your seal house.
Chapter III · Days 8–15
Backups
Protecting a castle is more than stopping attacks. Set up the scribe's room, carry your records to a remote vault and lock your most valuable ones in a chest no one can erase.
Chapter IV · Days 16–21
Crowds
Your market is growing. Is your castle? Handle rising traffic, learn your gatekeeper's limits and strengthen your outer walls.
Chapter V · Days 22–27
Patches
Even the strongest castle has weak spots. Follow the guild's notices, try changes in your test castle first and keep your defences up to date.
Closed beta
There's room for you in the castle.
castle is in closed beta. New accounts can only be opened with invited email addresses; get in touch to ask for an invite. Players aged 13–17 need a parent's email address, and the account opens once the parent approves. The game is in Turkish only.
Parents and teachers: just mention it in your invite request. Please don't share personal information about children.