Normally, your hero earns skill points slowly. The best trainer includes a "Max Level on Next Kill" option. One shot, one level 99 hero. This unlocks all passive abilities (faster movement, shield regen, bonus damage) instantly.
Players turn to trainers for several reasons: alien shooter td trainer best
For the absolute best experience, the Cheat Engine table for v1.3.0 is highly recommended due to its extensive features and stability. Normally, your hero earns skill points slowly