Jacksmith Level 31 - All Cannonballs Unlocked!

Regular Cannonball - Damages the enemy slightly and has the shortest cooldown. Unlocks at level 3.
Fire bomb - does damage over time to the enemy. Unlocks at level 9.
Repair bomb - Heals your own units a little bit. Unlocks at level 15.
Electric bomb - Enemy deals less damage on its next attacks. Lasts until enemy is defeated. Unlocks at level 21.
Booster bomb - Increases soldiers damage for a little bit. Unlocks at level 26.
Frost bomb - Freezes the enemy so it can't attack for a while. Has the longest cooldown of all bombs. Unlocks at a level 31 and is the last unlockable bomb.

All of the cannonballs serve a unique purpose. Try to use the ones with longer cooldowns (Frost bomb, booster bomb) on tougher enemies.

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