Geometry Wars 3: 50.Topaz (final boss) - 64 million

Final level of the adventure mode in Geometry Wars 3. I keep getting my drone stuck in the core after second phase which is silly (it's why I avoid shooting for so long afterwards) 70 million seems very doable if you play better and get decent luck. Fun game, will probably keep at it for a while. This is on the PC/Steam version. I'm guessing the leaderboards are a lot more active on 360 and PS3.