Good news for fans of Civilization game series. Developer Firaxis announced early buyers of Civilization VI will receive pre-order bonuses and freebies. Led by the great emperor Montezuma I, the Aztec Civilization Pack is the developer's treat for those who pre-order the game.

The Aztecs, one of the new civs, have unique features that are enjoyable to explore. This civilization has an exclusive unit called the Eagle Warrior, which can turn defeated enemies into Workers to speed up the construction of districts.

Furthermore, Aztecs have bonuses that provide additional power to its military units. They have a unique building called the Tlachtli, which is an arena-like court that has amenities and luxury resources. Last but not the least Aztecs have great temple called the Huey Teocalli. This giant terraced pyramid is where most of the important Aztec rituals are held.

For those who want to pre-order Civilization 6, visit Steam and Amazon. The game will be released on October 21 for Windows PC. By the way, the Aztec Civilization pack will be available for everyone else 90 days after the game's launching.

As for the significant changes in Civilization 6, Polygon reported the cities have bigger roles in the game. Instead of occupying a single tile, the cities can now spread across multiples tiles. Players should also place buildings in a strategic location. For example, placing a campus next to a jungle has huge bonus when it comes to wildlife research.

Additionally, choosing where to place cities has impacts on gameplay, like being forced to make a decision in war about which tiles to defend. Players can also sprawl city over a large area, with various buildings popping up all over, instead of building a single city surrounded by identical markets.

The A.I. controlled civilization will be different as well. In Civilization 6, expect they have some kind of agenda that drives their decisions and behavior. Interestingly, players can change A.I.'s attitude by invading them very quickly. This means diplomacy will be dynamic because it will change in every age, said Andrew Garrett, an A.I. expert.

In terms of graphics, the next entry in Civilization series has improved visual style that provides brighter and detailed images. The animation looks awesome and very functional. Players can see the mood and mindset of AI characters by looking at their expression.

Check out the latest teaser of Civilization 6 below.