City DefenseCity Defense: tower defense on a real city map
City Defense is a free tower defense game you play in the browser on a real 3D map of a city. You build towers on the roofs of real buildings, enemies walk real streets, and the map is built on the fly from OpenStreetMap data. The first mission is náměstí Svobody in Brno, Czech Republic, and the mission editor lets you set up a mission anywhere in the world.
City Defense is free to play in your browser – no download, no sign-up. First mission: Brno, náměstí Svobody.
Play free- Genre
- tower defense (wave-based defense strategy)
- Platform
- web browser with WebGL 2, on desktop and mobile
- Price
- free, no sign-up, no download
- Map
- real cities from OpenStreetMap (OpenMapTiles vector tiles served by OpenFreeMap)
- First mission
- Brno, Czech Republic – náměstí Svobody, 10 waves
- Content
- 5 towers, 6 enemy types, 4 bosses, dynamite, airstrikes, 6 visual themes, mission editor
- Language
- English and Czech (game interface and articles)
- Website
- citydefense.app (public since September 2026)
How it differs from a classic tower defense game
- The level isn't drawn – it's a real city. Streets, buildings and building heights come from OpenStreetMap.
- Height matters. A tower on a taller building reaches further. Machine guns and lasers need line of sight; mortars and howitzers fire over the roofs.
- The city is destructible. Buildings have hit points, lose floors and collapse. Rubble buries streets and changes enemy routes.
- Enemies attack your buildings too. Shooters, sappers and bosses try to bring down the buildings your towers stand on.
- You can make your own map. The mission editor builds a mission anywhere in the world, and you share it as a link.
Articles about the game
- How to play – rules, towers, enemies, destruction, dynamite, airstrikes and bosses.
- Tips and strategy – where to put towers, when to upgrade and how to use rubble.
- Tower defense in your own city – a step-by-step guide to the mission editor.
- How maps and missions are made – from map tiles to a street network, gates and spawn points.
- Games on real maps – how City Defense compares with other games built on a map of the world.
- Building heights in OpenStreetMap – where building heights come from and how to fix them.
- Technology – MapLibre, three.js, vector tiles, Web Workers and KTX2.
- Map data and credits – OpenStreetMap, 3D buildings, model and texture authors.
- FAQ – price, mobile, language, saving and sharing missions.