SpaceChem

Most puzzles make you feel intelligent when you get level done, but this game makes you float in air like almighty godking whose genius mind is not fit in this world of mortals.

So this game I've resently played is one of best puzzles I've played and good timekiller.
It's puzzle game called "SpaceChem" which I found via steam. Its fanbase is growing pretty fast, even though it's not game for everyone, it has it's own niche.

                                        SpaceChem is all about assembling molecules from simple atoms using a series of programmable commands. You work from a grid and two colored WALDOS that function as conveyor belts. By laying commands on to these belts, you can move elements around the grid, outfitting them as instructed by the level goals, and depositing them in the correct positions.

I do like play good puzzle games, not maybe favorite genre but they'll do.
First time I played this, the time was flying and soon I had working on it for 3hours straight, something unusually long for me to play puzzle game.

I were good in chemistry and other natural sciences at high school, so I though this game propably is easy for me. But boy I was wrong.

Really this game has not much to do with actual chemistry (only number of bonds, correct molecyle structures etc.) as the main thing here is to build a production line as simple and efficient as you can. So no worries if you don't know much about chemistry, it wouldn't help anyway.

You can do really large and complex lines and still you end up with some weird molecyle instead of the specific one. 
But after you have thinking and testing solution for few hours you may come up with maybe some simple change that makes it work like a dream!

And soon after that you just watch in deep euphoria how your production line spits out perfect molecyles. It is really great feeling, something that you can't really expirience in most games.

Also if you feel game is laughing how much you can suck at it, you can run raging in to youtube and put the mission name on search and there is likely to be solution for every mission (I believe), as there is in-build record possibility after you complete level and the video it creates is easy to upload on youtube.

This game really requires thinking. There won't be any hints and desing is not forgiving, the molecyle must be perfect. No just remembering certain patterns in this game, but to think abstract - real honest problem, you will work on problem, refine it and maybe get solution.

So if you feel interested, try the demo from steam or website: http://www.spacechemthegame.com/
Even it's demo, it's very long and sufficient.