Popular games published by company Rovio Mobile Oyj

Darkest Fear is a puzzle exploration game containing switches, boxes, doors and various dynamic light sources (like flashlights and lanterns) that the player uses to solve puzzles. In this game Thomas Warden searches for his lost family members (his wife Susan and his daughter Helen) through fifteen missions in a monster-ridden old hospital. He has to talk to other patients and find ways to travel deeper into the hospital. Thomas' most important enemy is darkness. Venturing in the dark deals damage, so he has to open windows to let the light in, find light switches or carry lanterns and flashlights. He is also able to lit fireplaces, carry mirrors and talk to other characters. There are multiple endings and the plot continues in the sequels Grim Oak and Nightmare.

Grim Oak is the second game in the Darkest Fear trilogy. It takes place five years after the events of the first game. The game now takes place in the town Grim Oak and features Thomas Warden again in the most important role. The gameplay is still shown from an overhead view and consists mainly of small puzzles, usually based on light. This time there are more light sources, three hidden mini-games (a darts game, a worm game and a Pong game) and the whole town of Grim Oak to explore instead of just the hospital. The player can revisit places, battle monsters and solve item puzzles.

Nightmare is the third and final game in the Darkest Fear trilogy and features two playable characters instead of just one in the previous games, Thomas Warden and his daughter Helen with cooperative gameplay. The game mechanics remain the same: survival horror mainly based on light sources and lots of puzzle solving, all shown from an overhead view. The game has a hidden Pong-like mini-game, 15 different endings, and Helen can obtain three unique monster abilities.