Cell culture is a simulation that simulates the spread of culture across a planet. The planet is represented as a grid of cells. Each cell has several variables describing the amount and kind of life present at that location.
This prototype can be downloaded here: 
Life grows and spreads from cell to cell based on these variables. The more favorable the conditions, the faster the rate of growth and spread. The grid has elevation and multiple cultures. Not much is very known about most of the life simulation factors.