Although it is similar to SimEarth and SimLife in many aspects, Evolution is fundamentally a different game because of its emphasis on strategy - and therefore probably the world's first program based on evolution to be qualified as a "game" (as opposed to Maxis' "software toys"). There is a pre-defined goal: be the "best" survivor in this historic world. You do this by accumulating score: similar to Civilization, the game ranks you using several criteria. These include size of population of your "clade" (i.e. your original species and all the species that descend from it), number of times your clade evolves a new species, and evolving the first intelligent species. Although you do not have to be the first to evolve the first intelligent species to win, it is much easier to win if you do because doing this gives you 50% point increase. This goal is easier said than done, since you have to deal with a myriad of natural disasters (including dramatic meteor showers and volcanic activities, to name but a few) in addition to opponents (which can be either computer- or human-controlled). Crucial to your success is the decision on what species to evolve next. While there are more than 170 unique species available, only one player in the game can evolve into a specific species at a time, making it a real challenge to evolve those critical species before other players in the game beat you to it. Many in-game charts and graphs are indispensable to your strategy, as well as the complex and awe-inspiring "Tree of Life" that gives you exact breakdown of requirements for evolving species. The Tree of Life is a bit hard to read because the text and the lines are so small, but that is a minor gripe compared to the overall excellence of the game.
Similar to most real-time strategy games such, you control and manage all 'units' of your species directly. Battles are unavoidable, especially when someone beats you to a species that is critical for evolving into that intelligent race you are researching. True to history, while you are busy trying to survive, the environment constantly changes - tectonic plates and whole continents shift, resulting in dramatic changes in the survivability of your species. This requires you to constantly monitor the environment and adjust your strategy accordingly, making for an exciting and rewarding experience. I learned a lot more about evolution while playing this game than I ever did in school :)
The "bells and whistles" components are all up to par, and add to the experience. Graphics is very good - you can tell which species it is by its icon and animation. Discovering your species' characteristics and preferences is half the fun, and evolving them into new species is the other half. To round things off, up to six players can compete via serial modem, LAN, or the Internet. Despite a major omission in the first release that saw the curious absence of "historical Earth" scenario, you can still download that from the game's official website at Discovery Channel among other places. When all is said and done, this is one of the few RTS games I played into 3-4 a.m. - and I never learned this much while playing Starcraft ;) Highly recommended to RTS fans and anyone who is interested in evolution of life on Earth.