I used to waste all my parents euros playing that game on a machine when we visited Spain. We went to the pub around the corner from where we stayed, there was a swimming pool, kareoke, cheap beer, free sky on plasma screen tv and it was next to the beach. I enjoyed all the other stuff but after we went there for the twenty-second consecutive time, I got bored. Then I found the Metal Slug machine
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I always got stuck on this boss where you have to jump up this tower away from this giant snake thingy and it's trying to eat you or something.