We had the chance recently to check out a mission taken from the middle part of the game, and from what we saw, ParaWorld looks like it should have a lot of depth for real-time strategy fans. For example, perhaps the most interesting new gameplay innovation in ParaWorld is what's dubbed the "army controller," which is a panel on the left-hand side of the screen that lets you control every unit in your army. However, the army controller is much more than that, as it also will force you to make strategic decisions on the composition of your army. That's because there are only 52 slots on the army controller, which is the maximum number of units you can build. Those 52 slots are divided into ranks, and there are 25 first-tier slots, 15 second-tier, eight third-tier, three fourth-tier, and only one fifth-tier slot. As you accumulate experience in the game, you can promote units up to the next slot, assuming there's room. Regular units will become more powerful, while hero units will gain extra new powers and will grant bonuses to other units, depending on the hero. But since there are only a limited number of slots, you have to carefully weigh which units to include your army, as well as which units to promote. You can also use experience to "age up" your tribe, much like you could "age up" your nation in Rise of Nations. This lets you unlock new types of buildings, units, and technologies, and it represents the scientific know-how that the scientists possess.