More like Hide and Seek

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Known SpaceUniverse
universe142 books1964
About aliens, set in other star systems.
“Give a clever species a few centuries and a working fusion drive, and it will fill the sky with problems.”
from the catalogue
Start with Ringworld →
includes Ringworld, Fleet of Worlds, Man-Kzin Wars
HeecheeSeries
series19 books1972
completed
Space opera, about aliens, set in other star systems.
“The Heechee are an advanced alien race that visited the Solar System hundreds of millennia ago and then mysteriously disappeared.”
from the catalogue
Start with Gateway →
The Colors of SpaceNovel
Marion Zimmer Bradleystandalone novel1963
Space opera, about aliens, set in other star systems.
“The Lhari seem peaceful and friendly, but they go to some lengths to protect their monopoly on faster-than-light travel.”
from the catalogue
Academy / Priscilla (Hutch) HutchinsSeries
series16 books1983
About aliens, set in other star systems.
“Beginning with The Engines of God, the series treats deep time and the near-total absence of intelligent alien life as its central mystery, favoring slow-burn discovery over action.”
from the catalogue
Start with The Engines of God →
The AvatarNovel
Poul Andersonstandalone novel1978
Space opera, about aliens and political intrigue, set in other star systems.
“With the aid of the political opposition, they escape and journey through the portal in search of knowledge, and perhaps even to meet those who created the portal system.”
from the catalogue
Starman JonesNovel
Robert A. Heinleinstandalone novel1953
Space opera, about coming of age, set in spaceship.
“Starman Jones, a 1953 science fiction novel by Robert A. Heinlein, features a farm boy who wants to go to the stars.”
from the catalogue