As the title suggests. What is your favourite playable game demo? For me, that choice is easy - I really, really love the Halloween and Christmas demos of LocoRoco. Not only is that game absolutely amazing (Vita sequel please Sony), those two demos were almost DLC level of quality, with a remix of graphics, music, and gameplay elements - and all of it was absolutely free. Finding all the flowers within the levels was quite tricky, and I am sure if the game was released to day we would have to pay money for those extra levels.