Entity Help

Jul 6, 2015
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Is there an entity that can store values and have those values changed by logic relays?
Also is there a way for one entity to trigger based off the value mentioned above?
Ex:
I want to shoot something, two times to activate something
Shoot it ocne, shot triggers a +1 tot eh S value for the entity
Shoot again, shot triggers a +1 to the S value, and something is triggered