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If you ever have a spare 5,15,30 or 60 minutes, I suggest you try a game of Dwarfs!?
Ok, true, you have to go trough the tutorial a bit to get a bit of an understanding of the game, but after that, it's a nice nifty game that wants you to beat your own highscores over and over again.
It's F2P on Steam and the Arcade mode in Easy and Normal gave me enough challange for hours of fun. And the good thing... you are always certain you are finished after the timeframe you chose.
So, give it a shot and don't forget to add tussengas to your steam's friendlist oh and ehm, the voiceover is from no-one less then Honeydew of the Yogscast.