The Skill Tree

The Skill Tree is a.. well... skill tree! Everytime you gain a rank, you get 1 skill point to put on the skill tree. The skill tree has all sorts of abillities and upgrades that will positively affect your gameplay. There is also a seperate skill tree for every tower, and you get skill points for those trees by "leveling" the towers up. After you unlock all upgrades on a tower, you can still use them and they will start to get experience, shown on a bar below it's picture. Everytime it levels up, you get a skill point to use on that specific tower's skill tree.

General Skill Tree
Tier 1

Skill Tree Unlock (0/1): Unlocks all skill trees.

Tier 2

Heavy Rubber (Requires Skill Tree Unlock) (0/20): Slows down bloons by 1% per skill point. To up this skill past level 10, you need to be rank 20.

Starting Cash (Requires Skill Tree Unlock) (0/10): Increases your starting cash by 25 per skill point. To up this skill past level 5, you need to be rank 20.

Tier 3 Popping Instinct (Requires 3 ponts in Heavy Rubber) (0/1): Increases every tower's popping power by 1.

Starting Lives (Requires Starting Cash)(0/30): Increases you starting lives by 5 per skill point. To up this skill past level 10, you need to be rank 30. To up this skill past level 20, you need to be rank 50.

Proffesional Merchant (Requires 5 points in Starting Cash) (0/10): Reduces tower and upgrade costs by $5 per skill point.

This will take a long time to finish. Be patient, as I will be (probably) updating every day!