Attack Damage

Use
It is used for increasing the base damage of every missile. It is one of the more fundamental upgrades.

Unlock
The upgrade is unlocked at the very start of the game.

Extra information

 * 1) You can upgrade it up to 30000 times
 * 2) Note than every time you level up it, for level 4 to upper, you will increase damage more than 3 points.
 * 3) There is a research in the laboratory than increases efectiveness of this upgrade every time you research it.

Base damage list:

 * Level 1: 3.
 * Level 2: 6.
 * Level 11. 40.
 * Level 12. 45.
 * Level 12. 45.