Creeps

A creep is a monster that you are supposed to defend against. They can be killed by being shot by towers (or in the extra mode Stampede, running into them). As the waves progress, they gradually get harder to beat. A boss creep comes in smaller numbers than a normal creep, but has significantly more health.

Types
There are many types of creeps. They are all listed here:
 * Normal (Creep)
 * Immune (Creep)
 * Group (Creep)
 * Fast (Creep)
 * Spawn (Creep)
 * Flying (Creep)
 * Dark (Creep)