Brave Frontier, one of the best minimal JRPGs I've played in quite a while. Not only that, they are also very generous when it comes to rewarding the players with a lot of gems making Free 2 Play players more competitive when compared to Pay 2 Win players. Of course, we did think about it for a moment whether we wanted to hack such a great game or not but... As they say "Play your games, your own way." so we decided to hack it anyway. I believe Brave Frontier is one of the easier games to mod as most of their 'Currency System' (Including their 'Gems') can be modified via a Hex editor when unpacked.