thanks for the feedback,
i implemented the theme as you have a cupon(forgot to mention that the vending machine accepts cupons too but the deadline is over now) and it's expire if the time runs out
i thought this was good idea:
timer: time
cupon: key
but it's seems that isn't.
maybe i should writed the story shorter(and mentioned that policy)
and as the sword i don't know why but thanks for pointing it out.