As most people know singleplayer AI is way to easy. That's why everyone plays multiplayer. I have little suggestions that could improve the single player experience.
- In Domination, make the AI always choose Super Unit instead of Parks. I've noticed that the AI upgrades their cities in a 50/50 manner. Making the AI choose a specific type of upgrade will help make the AI more challenging. (Super Unit over Parks, Workshop isntead of Explorer, etc)
- Treat Defenders and Swordsman similarly. Defenders and Swordsman have the same 3 defense and the fortify skill. What is weird is that the AI treats them differently. The AI treats Defenders as if they don't exist, and never attacks them. But if you put a swordsman in a city, they will start attacking the swordsman. Even if the defenders will die to 3 knight hits in a city (no city walls), the AI surrounds your city with knight spam but will just ignore that vulnerable defender. So my point is make AI behavior towards Defenders and Swordsman similar.
- Make AI controlled Polaris use other troops other than Ice Fortress and Battle Sled. When the AI controls Polaris, they rush to Polar Warfare then spam Ice Fortress and Battle Sled early on. While in Early Game this is really effective, in Late Game when other AI and Players have Knights and Mind Benders, this strategy starts becoming a little obsolete. Knight spam can easily take Ice Fortress defended cities, due to Ice Fortress not having the Fortify Skill. If Polaris used Ice Archers and a variety of troops (like defender to defend cities instead of battle sled or ice fortress), it would make late game Polaris AI more difficult.
- Make the AI in general use more variety of troops other than Knight or Mindbender spam. Even in Crazy AI, the AI always uses the same strategy. Its always Rider spam, then Defender spam, then Knight spam, and finally Mindbender spam. I have rarely ever seen the AI using Catapults (which are crucial late game), battleships (also crucial late game), or Archers. Using more of these troops late game would make the late game experience more challenging. Right now, if you manage to survive the first 10 turns, the AI is so bad that late game is very easy. Having the AI use catapults or battleships would improve late game experience so much.
- Don't ignore Defenders. I know they made this interaction because the AI was too aggresive towards them, but right now Defenders are too OP. Make the AI attack defenders with Archers, Catapults, or other ranged units or even knights/swordsman. Just don't plain out ignore the Defenders and let them take your city.
These are just small suggestions that could improve the gameplay of single player.
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