Other than minor updates to run on the newer Windows platforms, the game is still in its original retro format and is free to play.
Also, stationary fort defenses which existed from the start of the game (Thugs) as AI's have been made player-usable.
Each castle has 4 control pylons and can have a maximum of 20 stationary ground defences including the Power Plant and Radars.
Mobile bases only have 2 control pylons, a maximum of 16 stationary ground defences and they cannot have any robot defenders.
There are two main types of stationary ground defences available for construction at Castles and Mobile bases, either of which can be built at a maximum distance of 3 km from an allied asset.
When connected to another repulsor, an invisible wall is formed between them and if any enemy vehicles try to cross it, they will be repulsed back roughly 400 meters.
It is general practise to have at least 6 repulsors in a pattern so that they are connected and cover the pylons, this is called a "Rep Field".
If a player wishes, they may jump into the thug and take advantage of the strong armor and high ammo count.
The process takes around 30 seconds and a player is entirely vulnerable during that time, including from an opponent killing the AD itself.