Buildings (Classic)
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Sentry Gun
The Sentry Gun is the Engineer's attacking Building. It can be upgraded to level 2 and level 3 at the cost of 200 cells per level. Wrenching a Sentry Gun with a sufficient amount of Cells carried will instantly dedicate all of those cells to upgrade the Sentry Gun. At level 3, the Sentry Gun grows a Rocket Launcher in addition to its machine guns. Using the Engineer's abilities, it is possible to rotate the Sentry Gun's facing direction.
Dispenser
Dispensers provide ammunition to all players, teammates or otherwise. The Engineer will be notified if anyone is using his Dispenser. Detonating one's own Dispenser will deal damage to all enemies in range of the explosion based on how much ammo is stored within; it will automatically detonate when an enemy destroys it. The Dispenser cannot be upgraded.
Teleporters
The teleporter entrance and exit pair are what allows the Engineer's teammates to rapidly move to the front lines. Players who have recently taken a teleporter will be enveloped in a team colored "glow." Like Dispensers, the Teleporters cannot be upgraded.
