A World That Was Not There by Joseph Mohr is a role playing game supplement published by Old School Role Playing for use with Cepheus Engine. As such, it is covered by the Open Game License and some parts are considered to be Open Game Content as a result.
The supplement is available as a 17 page Pay What You Want PDF from DriveThruRPG. Two pages are the front and rear covers, three the front matter and three the Open Game License.
The opening paragraphs explain that a world has just appeared in a major trade route in the Sonora sector – the adventure is set in the Frontiers of Space – and poses a navigation hazard which the characters are hired to investigate.
Patron has some details on the employer.
Complications are things that aren’t known or which can go wrong.
The Vacuum World has some details on the planet.
The Aliens gives some details on the, missing, aliens who built the world.
Encounters in the Complex has the chance of encountering the single occupant.
The Complex covers the various locations.
The Engines covers the engines that move the planetoid.
The Power Supply covers the reactor.
The Ancient Terror gives some more brief details on the inhabitant.
What Can be Done About this Planet has some potential ways of removing it as a navigational problem.
Translation looks at the chance that a universal translator might translate writings found.
Time Displacement and Why the Planet Has Not Been Discovered Before explains this.
Attempts to Contain the Creature with Time Displacement looks at this.
Restarting the Time Displacement Device looks at trying to reactivate it.
Mission Completion explains this is done by simply exploring the planet and delivering a report, though more can lead to a further reward.
The final page of content has a map of the complex.
A World That Was Not There in Review
The PDF lacks bookmarks and is long enough with enough different sections that these would have been useful. Navigation is okay. The text maintains a single column format and some minor errors were noticed. Bar the map and covers there are no illustrations. Presentation is okay.
This is a simple enough adventure with only one major danger to deal with, though there could be other issues. All the characters have to do is explore the complex and not die, though they gain extra benefits if they do more A World That Was Not There can be found by clicking here.

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