Just WOW! If you like a good adventure game with lots of things to explore, some hard puzzles and beautiful artwork, then Machinarium is your game.
Without a single spoken word the story line is set very well in a world where machines have feeling too. The ambiance is amazing and the puzzles very original. You just gotta love the main character and the creative ways he finds to defeat the bad guys. The humor in the game is great too.
For me this game could have lasted for several hours (days, weeks!) more, without ever boring me. The game also offers a unique hint system, so there's no need to search the internet to be able to advance in case you're stuck. I recommend not using it too often though, because the game is much more fun by solving everything yourself.
If machines ever take over the world, I sure hope this is what it will look like. The downside? Maybe the fact that there's no Steam achievements. Really can't think of anything else. This game is a must-have & must-play!