Skill Systems

Original System
In the Original System, the player can choose one of two skills at certain levels.

Ability Alterations
The first seven heroes (Marine, Medic, Firebat, Reaper, Ghost, Psion, and SCV) have this added to their Original Systems.

When the player chooses the hero or clicks the "P" button in the bottom-right followed by the "Hero Points" button, a menu pops up that enables the user to temporarily "spend" Hero Points to alter their hero's skills.

New System
In the New System, all but the hero's "t" skill is enabled at level 1. Unlike in the Original System, the player does not have a choice between two skills. However,

Perk System
All heroes with the New System have the Perk System as well, with the exception of Specialist. .The player can choose a "Perk" starting at level 5, up to level 30, every 5 levels. There are several options offered at each interval, and the player can choose one at each interval.