I had a lot of fun with my "see me once, see me twice" question, so I thought I'd make a series out of them.
So here is the next riddle:
see me once, the hammer falls.
see me twice, the gamer calls.
As last time, it starts with only one 2-liner. Additional hints will be given almost hourly.
see me once, and I'm hidden inside
see me twice, game over is implied
see me once, when I'm lighter than a plum
see me thrice, out of the tunnel you come
Third Hint: (and last one for today)
the "see me once" part refers to a different meaning of me in every two-liner
the see-me-once in the first hint feels really good when found.
What don't you have in tunnels? It doesn't matter whether you're in a train or a car
See the last one in the series: See me once, see me twice #1