SpaceChem

SpaceChem - a new puzzle with a unique design.
You play as a SpaceChem Reactor Engineer, which, using the available source chemical elements, using chemical reactions, nuclear fission or synthesis to create new ones.
The game is divided into several episodes, and the episodes, in turn, are divided into stages. Stages are divided into three categories by type — research, production and defence. In the research stages (usually they act as training tasks for new capabilities of the reactor), only one reactor is available to the player. In the production stages, the player opens several reactors, and he, combining them with pipes, must provide cargo ships with the necessary chemical elements. In the defensive stages (usually the final tasks of each episode), the player must be using the available means, stop any monster trying to destroy the production station SpaceChem.