If you have completed the original 200, you will already be at level 50, and will have unlocked the 250,000 buy-in for tournaments. If not, then it is advisable to get to level 50 before going for this one. Start a standard game with 10 players per table, with a 250,000 buy-in. Every single hand, go all-in. You are bound to lose a few and go bust, but you can re-buy-in as many times as you like. After a while, there will be a lot of chips at stake, and some amateur players who like to go all in. Eventually, there will start to be some huge pots available, and you need to take a big one. Note that you have to win a million credits, not including your own. If you have busted a few players and busted yourself a few times, there will be millions of chips on the table, get yourself a few million, then carry on going all in. If you go all in with at least a million, and you get called and win, you should unlock this. Carry on with this method, and getting 10 million chips for "High Roller" should be well within your reach.