Puzzles by keycard
You usually find a card before you decide where to spend it. Every puzzle is grouped by the card it wants, with the fuses to bring and what is behind the door.
Green keycard
| Monument | Fuse box | Doors it opens | Other cards on the same run |
|---|---|---|---|
| Harbor | FuseBox | 1 | None |
| Military Tunnel | FuseBox Entrance | 2 | None |
| Large Harbor | FuseBox | 1 | None |
| Airfield | FuseBox Surface | 4 | None |
| Ferry Terminal | FuseBox | 1 | None |
| Train Yard | FuseBox | 2 | Blue keycard |
| Radtown | FuseBox | 1 | None |
| Satellite Dish | FuseBox | 1 | None |
| Radtown Small 3 | FuseBox | 2 | None |
| The Dome | FuseBox | 1 | None |
Blue keycard
| Monument | Fuse box | Doors it opens | Other cards on the same run |
|---|---|---|---|
| Power Plant | FuseBox Control Room | 2 | None |
| Airfield | FuseBox Armory | 1 | None |
| Train Yard | FuseBox | 2 | Green keycard |
| Water Treatment Plant | FuseBox | 1 | None |
Red keycard
| Monument | Fuse box | Doors it opens | Other cards on the same run |
|---|---|---|---|
| Launch Site | FuseBox | 4 | None |
| Launch Site | FuseBox | 4 | None |
| Military Tunnel | FuseBox A | 2 | None |
Traced from each monument's own wiring: every fuse box followed along its power outputs to the card readers and doors on the other end. One card of each colour is enough, since a reader does not consume it.