Grand Theft Sonic: The Mysterious Emeralds

Emerald Zone is an anime series created by Sarah West, with the help of JessicaFin23 and Sonic876 2.0.

Synopsis
A girl named Katrina discovers a magical emerald that gives her access to a mysterious place known as the Emerald Zone, which is full of paranormal forces and supernatural creatures. Katrina has wacky adventures while she solves the Emerald Zone's mysteries.

Trivia
The series, in premise, is similar to Gravity Falls, while the magic emerald that gives Katrina access to the Emerald Zone is similar to Rudy's magic chalk in ChalkZone. The title of the series itself is similar to The Twilight Zone.