Side rooms are small mini-levels which are reached through a Cyan lift. Unlike other levels, these only have a single lift and you exit back to the same level you came from.
Entering a side-room still counts as entering a new level, triggering life gain on level change effects (such as Marine's trait) and removing overflown health, power and energy. Returning to the original level will remove overcharge, but not count as a new level for healing. You can go in and out of side rooms as often as you want.
Side rooms are often the subject of Messages, and are highly likely to contain stations and purple chests.
Laboratory[]
A laboratory is often a series of 4 small rooms with a horseshoe layout. It usually contains a station.
Safe Room[]
Storage Room[]
A small room with two normal lootboxes and an exotic lootbox behind the elevator. Be wary of a lot of enemies with clear lines of sight.
Strongroom[]
A strongroom often has a foyer with 2 doors leading to a circular corridor around one large reward room. It usually contains a purple chest and an exalted pack.
Workshop[]
A workshop often has a foyer and a single large room containing enemies and rewards. It usually contains a purple chest and one station.
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