This is the basic game without any added OXPs.
If you choose Strict Game when you start up Oolite, this will constrain you to the basic vanilla game, excluding whatever OXP/OXZs you may or may not have loaded.
Older Versions of Oolite
The Vanilla game used to be very different from the oxp'd game. The strict game before Oolite v.1.80 was not just an oxp-less version of Oolite. It was a mildly modified version of the original Classic Elite. In those days, the Vanilla game was just the (regular) oxp-able game - but before adding in any oxp's.
Optional vanilla-game equipment lost in the original strict game:
- Fuel Injectors
- anti-ECM missiles ("hard heads")
- shield boosters
- scanner targeting enhancements
Game options lost:
- contract hauling
- the F5F5 cargo-hold manifest screen
- the F3F3 shipyard
- no navigation beacons
- no stopping at a standstill