Little more information on the game from Wikipedia:
The story of Steins;Gate takes place in Akihabara and is about a group of friends who have customized their microwave into a device that can send text messages to the past. As they perform different experiments, an organization named SERN who has been doing their own research on time travel tracks them down and now the characters have to find a way to avoid being captured by them.
The game is an ADV, or interactive graphic novel where the player mostly is following along the story making choices occasionally that will affect the overall story. The game also has a manga adaptation (which is something else I'll have to look into).