If they placed this feature may be several overdrive. ^_^ Overdrive of freezing: brakes the enemies for 3 seconds Double Shot Overdrive: Causes the gun to fire twice without reloading with double damage Defense overdrive: +10000 sum of life when activated or becomes immune to damage for 7 seconds Overdrive of nano shield: it adds a species of indipendiente shield of the life deltanke with a bar visible to the enemy this will have an amount hp Overdrive of mine recharge:causes the mines to increase their damage and their recharge time is reduced to 40 seconds (so it can be used at ease) These can be bought in the store will have a very high price depending on its characteristics And of course their respective icons when activated :P I have many more ideas but I think these are fine.