I read that Gladiacoin would Double my bitcoins every 90 days. Paying 2.2% a day back. I invested 4.2 bitcoins with them and they were paying they suspended trading for 10 days then started paying again for about 5 days then they put in a mandatory 15% admin fee to be paid or your account would be shut down. They took all my Bitcoin stole it and about 6 of my friends coins and partial coins. There were different levels that one could invest in as little as 10 th of a Bitcoin and up. They were total Poncy Scheme.