You play professor Alan Russell, an eco-activist who was offered by a company
named Subtech to design Biosphere 4. Biospheres are large complexes holding
artificial ecosystems. Russell wanted to develop a synthetic plant that could
efficiently transform CO2 into oxygen. But those plants soon turn to be
killers: they can move and suck CO2 from the lungs of human beings. Russell
opposes any further works connected to those plants, but Subtech continues the
researches and is unable to prevent a disaster…

Russell is trapped in Biosphere 4 and has to find his way out. There are four
ecosystems (“biomes”) in Biosphere 4: rainforest, savannah, ocean, and
accelerated evolution. Russell has to overcome all obstacles and to stay alive
in this bizarre world.

Biosys is an adventure game with simulation elements. You control the
environment in the artificial world, but you also have to take care of your
own condition. You must drink, eat, and sleep. Different kinds of nutrition
will have different effects upon you, your condition will change depending on
where you decided to sleep, etc. The rest is standard puzzle-solving gameplay:
finding items, operating switches, etc.

Biosys