Cinemadoku is a game where you need to place movies and actors/actresses in positions where they're touching things they've been in. For example, Hugo Weaving was in V for Vendetta. But he's also been in two other movies I have available, so I need to place both of them around him. Natalie Portman was also in V for Vendetta, so you would place her next to the film as well. So on, and so forth until you complete the board.
Even if you're not a huge movie buff, it's not as hard as it may initially sound, as there are hints to help you if you need it. There is at least one new puzzle released every day, and as of writing this, there's already 1,164 puzzles. It's a nice, quick game to play when wanting to pass the time. But be warned, it's addictive!