테크 트리는 아래와 같습니다. Cannon 3 shots/sec speed: 4 range: 100 basic damage: 1 Heavy cannon Ⅰ 3 shots/sec speed: 4 range: 100 basic damage: 2 60$ Quick Cannon Ⅰ 4 shots/sec speed: 4 range: 100 basic damage: 1 40$ Double Cannon Ⅰ 2 shots/sec speed: 4 range: 100 basic damage: 1 40$ Heavy cannon Ⅰ 테크 트리 Heavy cannon Ⅰ Heavy cannon Ⅱ 3 shots/sec speed: 4 range: 100 basic damage: 4 60$ Heavy Cannon Ⅲ 2.4 sh..