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There is an event going to June it is on the fifth floor of the guardians colony. Talk to the lady at the counter and choose special event missions. Choose either roar of flames or visitors memory.

It also helps if you have a high luck rating. C runs would give me 2 to 5 drops a run.

Cheat engine has been around for a long time and has NO viruses ...www.cheatengine.org
there you go have a nice day.

* I am sorry didn't see the date of the last post.