Lay the path that the waves of enemies advance in a variety of ways.
Read the towers/buildings card description carefully and place it in the appropriate location.
Flag-shaped resources allow you to build towers/buildings on empty land or water.
Bomb-shaped resources allow you to build new towers/buildings where there are already existing towers/buildings. (The road is not broken)
A powerful boss enemy appears every 5 rounds.

There are 3 difficulty levels. (easy, normal, hard)
Use gems on the start screen to buy level 2 towers/buildings or upgrade resources to take on higher difficulties.

There will be a balance update in the near future.