The game begins with a meteor flying into a star system and eventually crashing into the starting planet for the player. Upon entering the planet's atmosphere the meteor breaks into millions of pieces and one fragment lands into an ocean, opens up, and out comes a single celled organism which you begin the game as. At the microscopic level the game begins very simple with your only priorities being to find food in the form of plant cells, meat cells, or even other cells swimming around. What type of food you eat in the game will determine what type of multi cellular organism you will become in the latter stage. Eating food will recover your health and award the player DNA points. Once the player is satisfied with the number of DNA points in possesion they may use their "mating call" to find another cell and the players cell will lay an egg which bears the next generation of the player's cell. This will bring the player into the cell creator where they may add/remove parts of the cell to aid it in dominance of the tidal pool. Parts include flagella for speed, mouths to determine wheter the cell is an herbivore or carnivore(putting both and eating a balanced amount of plants and meat will result in an omnivore), and several other miscellaneous parts. After laying so many eggs and evolving so much the player will have the option of growing legs and moving onto land.
Now the game becomes 3-d and the player will interact with other species around the continent. The player may choose to be friendly to others which will result in them being able to heal at their nest and have them assist in hunting. Being aggresive the player may choose to attack the creature's species causing it to eventually become extinct and take it's nest by force. Either way the player will once again gain DNA points to evolve thier creature. Once the creature has evolved again and again,gaining a greater intellect each time, the creature unites other members of it's species and forms a tribe. Now the game enters a more RTS style of gameplay.
For those of you who aren't familiar with the RTS(real-time-strategy) genre wikipedia describes it better than anyone else http://en.wikipedia.org/wiki/Real-time_strategy. If you can't then I suggest you try another blog. Continuing on, The tribal stage has the player utilize the whole group as a team, having them gather resources, defend food, or in the case of an aggresive tribe they may raid other tribes for food. At this point the player no longer evolves thier creature and works on editing the outfits of the creatures. Interacting also has a new tone to it. Friendly tribes will bring their Chieftan(leader) to the neighbor tribes and attempt to establish a mutual friendship while once again aggresive tribes shall take the tribes by force eventually dominating the entire continent. Once either is done civilization stage takes place for planetary conquest then space stage for control of the galaxy.
Sadly describing every phase in full detail would be mind-numbingly stressful and cause a lengthy entry so that's the game in a nutshell. I highly reccomend this game, it requires pc or mac with internet connection. The graphics were nothing to brag about but greatly vary depending on the player's creativity, gameplay is extremely interactive, story is dull, and the replay value is extremely high up there. If you have a creative mind ready to explode then Spore is the only game for you but if your a die-hard gamer looking for intense gameplay and memorable game time then Spore should not be picked up. Overall I'd say the choice is yours but in my opinion I enjoyed the game and I had fun with it while it lasted so if you ever find the free-time to get this game then go ahead.