Stone Door
Building · Defense
Stone Door
A Stone Wall with a gate. Anyone presses T at it (or OPEN in the commander view) to open or close it. While it’s open, enemies can walk through too. It shuts itself 6 s after you’re clear. A little weaker than a plain wall.
| Category | Defense |
| Main crystal | Obsidian (builds walls and pays for upgrades.) |
| Build cost | 25 Obsidian |
| Upgrades give | +HP (anyone opens / closes it) |
Levels
Section titled “Levels”The cost on level 1 is the build cost; on later levels it is the cost to upgrade to that level. Your Base’s level caps how far every other building can be upgraded.
| Level | HP | Cost |
|---|---|---|
| 1 | 450 | 25 Obsidian |
| 2 | 900 | 50 Obsidian |
| 3 | 1800 | 100 Obsidian |
| 4 | 3600 | 175 Obsidian |
| 5 | 7200 | 275 Obsidian |
| 6 | 14400 | 400 Obsidian |
| 7 | 28800 | 600 Obsidian |
| 8 | 57600 | 1000 Obsidian |