1. Add a considerable amount of game instructions, from income to tips.
2. Add gold mines, which can significantly increase income.
3. Add ice towers, which can slow down enemies in an area.
4. Add gold warriors, which can deal area damage.
5. Add upgrades for the main city; after upgrading, you can purchase soldiers for attack.
6. Add level 11 Mammoth troops and level 12 Demon Lord troops, which can only be purchased from the main city and cannot be built.