Hark is a series of two gamebook

Gamebook

A gamebook is a work of fiction that allows the reader to participate in the story by making effective choices. The narrative branches along various paths through the use of numbered paragraphs or pages...

s written by R. L. Stine

R. L. Stine

Robert Lawrence Stine , known as R. L. Stine, and Jovial Bob Stine, is an American writer. Stine, who is called the "Stephen King of children's literature," is the author of hundreds of horror fiction novels, including the books in the Fear Street, Goosebumps, Rotten School, Mostly Ghostly, and The...

. The first book is called Badlands of Hark and the second is called Invaders of Hark.

Badlands of Hark

Badlands of Hark was released in 1985. It has 250 sections and 79 different endings. It is about a search for treasure on the dangerous planet called Hark.

Invaders of Hark

Invaders of Hark was released the same year as the book which preceded it. It has 250 sections, like Badlands of Hark but has fewer endings (59). The mission in the book is rescuing the princess of Hark from two invading alien armies.