Rooms and doors are the building blocks of metarooms and worlds. A room is a quadrilateral space usually taking the form of a rectangle with straight sides, although in C2 they may have floors of varying height and in C3/DS the top and bottom may be raised or lowered independently of one another.
Despite the name, areas that correspond to one visually contiguous space in the games after C1 - such as the incubator area in C2, the lower levels of the C3 Jungle Terrarium or the lower Norn Meso in DS - are normally composed of multiple rooms linked together. This allows for more natural flow of CAs and provides much more detail and variability in shape than is possible for a single large room, which can have only four sides. Regions in which neither is a factor, such as the C3 Crypt, are usually composed of a single room.
If rooms in C1/C2 are improperly defined, it can result in Black Holes forming.
C3/DS room types[]
| Number | Name | Description |
|---|---|---|
| 0 | Atmosphere | Heat and light travel well, nutrients and water do not. |
| 1 | Wooden Walkway | Insulates against heat, but permits water to drip through. |
| 2 | Concrete Walkway | Less permeable to more CA than a wooden walkway. |
| 3 | Indoor Concrete | |
| 4 | Outdoor Concrete | |
| 5 | Normal Soil | Fairly permeable to most CA. |
| 6 | Boggy Soil | Retains more moisture than normal soil. |
| 7 | Drained Soil | Loses more moisture than normal soil. |
| 8 | Fresh Water | Restrictive to heat. |
| 9 | Salt Water | Restrictive to heat. |
| 10 | Ettin Home | Loses the smell of machinery. |
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