Great game, and a nice break from the stress of multiplayer games or fast-paced shooters and non-stop action. It's calming and manages to make cleaning, a ususally horribly boring task, actually enjoyable. You can gain collectables and return them to your office for some achievments and this gives you something more to do than just cleaning and it's fun. The game also features a story-line that you're meant to figure out including a mysterious janitor named 'Bob' and notes in each level can help you determine what exactly happened to cause the disaster you're cleaning up. Overall, the levels take ususally around an hour or longer depending on the size and there's a nice number of maps. (There's workshop maps too). However, if you don't want to do it alone, you can invite friends to your game to help you clean up.