1. add new upgrades, remove some that are not useful.
2. update some UI to clearify how card works.
3. add "join qq" button for chinese player
4.update some hint logic so hints are more useful. and when hover over tiles, related hints would enlarge too.
5.change boss logic, now boss would be separate in a level.
6. add outline for text for readable
7. players are able to see cards
8. decrease cards and upgrades cost a lot