After wasting 10 minutes I found the secret-- it's a secret button called "Abandon". Worked well for me and cruised right out of there. For puzzle people, have a blast. For the rest the button works best.
LOL had a good laugh at this one, funny. Big mistake is that its in a public area, i solved it and then boom, someone changed it while we were going for guns, changed more than one so then tried to join the person to the group and continued to hit when asked not to. We hit abandon as well, no point to this and not worth the hassle. I enjoyed the puzzle but even with teamwork - not worth the reward. I know lots who just skip it as its a waste of time if you play in prime time.