I based the game on my mod, which has the following changes:
- Ancient tech except Monarchy and Republic + ~1/3 cost.
- Max research time 50 turns.
- Hills can be irrigated
- Tundra gives no food
- Resources give more bonus (now it`s worth fighting for them even if they aren`t strategic)
- AI-AI trade is 100% on Regent, 110% on Monarch and so on.
- Bombard changed accordingly.
- 2 new cultural levels, 1 at 5:2, one at 3:2 so rate can be judged better.
- more Uumpfff for battleships (bombard now 1,5 times that of cruisers)
- age bonus (1 to 4 HP) for advanced units,
- better attack for nuke subs and subs,
- changed HP to conscript=4, regular=6, veteran=8, elite=11
- changed bombardment accorgingly,
- added bombardment for all bow-equipped units and all fast units with guns plus tank and Modern armour,
- added free units / town for Republic since now often Monarchy is preferable over Republic because of large Military.