'Taiga' - meaning 'boreal forest' - is the latest attraction at the non-profit park, which opened in Helsinki in 1950.
The new roller coaster boasts over one kilometre of track, reaching 52 metres at its highest point.
Ahead of the ride's official opening on Tuesday, Linnanmäki's general manager Pia Adlivankin said, "Taiga has been specifically designed for Linnanmäki based on all our wishes and taking in consideration the challenging terrain."
"We expect Taiga to be of interest to both Finnish and international roller coaster enthusiasts, and we welcome all daredevils to challenge themselves by taking a unique ride on Taiga," she said.
Linnanmäki is run by the Children's Day Foundation and all proceeds are donated toward child welfare projects.
The park has enjoyed significant tax breaks for 40 years. Its super-non profit designation means that proceeds are exempt from corporate taxes.