1. Levels 12 to 15 for part 3 (Very difficult though)
2. New unit unlocked at level 14
3. Mini-boss at level 13
4. Buffed starting cash from 50 to 100 mainly to help complete part 3
5. New enemy level 12 onwards
6. Part 3 is the final part and there will not be a part 4.
Though there are no pass features as the revised version will have that instead.