As you might guess, AD400 takes you to ancient times and allows you to play a strategy game as three different empires: Western Roman, Eastern Roman, and the Hunnic Empire. There are strengths and weaknesses to each, which are spelled out for you when you make your choice. You can also experience different storylines with the different factions.
The graphics have a stylized, almost cell-shaded look at times and look very good for a browser-based game. I played the single player campaign and was tasked with expanding my territory, and had to recruit progressively stronger units to continue my progress.
If you remember different strategy RPGs like Final Fantasy Tactics, you’ll be at home with the battle system here. One major difference that effects tactics, however, is that you can’t attack units positioned diagonally, and instead can only attack enemies on the same row as you. The camera angle works fine for this kind of game play, giving you an isometric view of the action as it evolves.
You can also play against other players, where you select opponents to play against on the map. However, the AI has to fight for the defending nation during turns, so the versus mode is inherently flawed and I would recommend the single player campaign instead, as it is more fleshed out.
If you want a strategy fix and you like the time period that this game is based in, you will likely be very pleased with what you find here. The detail shown in the visuals, as well as with the strategy used in game play, is very evident and could keep you coming back for more.