One of my favourite websites is currently running an offer for Dungeon Keeper Gold (the old version). Check it out!
The game consists of you constructing a dungeon, filling it up with various monsters and killing the 'invaders' or 'heroes' trying to dungeon crawl through it. GOG have made this beauty free until 17th February in a celebration of valentines day and what more could you want out of your day in all honesty? It is available on both Windows and Mac.  They have also discount Dungeon Keeper 2!  Go on give it a try and have a wonderful Valentines day, we plan on spending our evening gaming and eating, how about you?  GlimGlamGirls x