Summary: Splendid puzzle game, one of a kind, definitely worth it provided that you are a puzzle gamer. The game offers a challenging and enticing learning curve, and the gameplay of continuously improving your design is definitely addicting. It is a little bit difficult and hardcore compared to most casual puzzles, but if you don't mind extracting some brain juice, you'll definitely love it.
Summary: The hardest puzzle game I've played in recent memory. There are loads of puzzles to do so there's no shortage of content. However it's more a matter of how much you can stomach playing. All the puzzles require you to start from scratch without hints (after the tutorial maps) and get increasingly complex, with more gameplay components being added every few maps. I don't know if it gets The hardest puzzle game I've played in recent memory.
Summary: Spacechem is a great unique puzzle game that involves use of chemicals from the periodic table of elements.With a great art style and very interesting game play that evolves as you progress though the story (as well as some neat tf2 items you can pick up from playing some special levels.)Spacechem feels like a game i want to keep coming back to for more puzzles and more fun.
Summary: Awesome Challangeing puzzle game. don't worry, you won't need to know anything about chamistry to solve the puzzle. -1 point for an insufficient tutorial. If you get trouble after the tutorial learn by watching a solution or two and then you'll start to understand the game mechanics.
Summary: I like puzzle games. But this one is the best puzzle game that I have ever played so far. The game is very challenging but yet very rewarding. The main concept of the game is to find solutions to generate certain chemical compounds from material compounds. For this purpose you have several operation commands. You combine these commands on the board to achieve the purpose, which is to I like puzzle games.
Summary: The level of difficulty on this game is sick! It starts out fairly easy, but it gets hard fast. Seriously, your brain will start to hurt with infinite ways to solve each puzzle as you ponder how to design a more efficient solution. One-click YouTube upload for easy solution sharing. Such a simple concept, yet so much innovation in this absolute must-have indie gem--so addicting.
Summary: I tire of games that are all about killing, or mind-numbing match-3 games. SpaceChem is fairly original, but most importantly, it's different from 99 out of 100 games coming out today. It starts out easy to get you used to how it works, but doesn't take long to start challenging you. As others have said, what seems impossible at first ("Surely it can't do that *and* that?" - oh yes it I tire of games that are all about killing, or mind-numbing match-3 games.
Summary: SpaceChem has been one of the most fulfilling puzzle games I have ever played. On more than one occasion I've been completely stumped by a solution, stumble off to bed, and dreamed of reactor errors only to sit down at my computer to find the solution in fifteen minutes the next morning. I've been challenged by many puzzle games in the past, but from their very design if I was stuck there SpaceChem has been one of the most fulfilling puzzle games I have ever played.
Summary: This has a linear learning curve, satisfying level design, and even a few bonus rounds and boss battles to excite while remaining strictly casual. The music and sound effects aren't particularly painful, the graphics are functional and smooth. There's also a plot, although interesting and grisly; it doesn't impact gameplay in any meaningful way.