Twistaplot is a series of children's gamebooks, that were published by Scholastic from 1982 to 1985. Books #1, #4, and #9, were written by R.L. Stine, who would go on to write the Fear Street series, and the Goosebumps series, which in turn, spawned the gamebook spin-off series, Give Yourself Goosebumps. The remaining books were written by Louise Munro Foley. They were Scholastic's response to the Choose Your Own Adventure series. After the success of the Goosebumps series, the books which were written by R. L. Stine were reissued with new covers in 1994 and 1995.
Source: Wikipedia, "Twistaplot", available under the CC-BY-SA License.