Mar 19, 2015 - SummerTimeStudio is excited to announce the worldwide iOS and Android release of its 15th title, Troll Impact - The Lone Guardian. In a spin on the tower defense action genre, the Troll, often seen as a hideous monster, is the hero. He must protect the Princess from the onslaught of marauding soldiers. Tap over the enemies and watch the Troll smash. Hold down instead of tapping for even larger jumps. There are ten unique stages, each with three levels of difficulty. Be a hero: Save the Princess.