Bloontonium Mine/Strategies

Strategy 1
Get 2 (3 if possible) Dart Monkey, one behind another on the long straight so that when you upgrade them to Spike-o-Pult, they can get the most of its popping tower. Get 500+ economy then build a 2/3 Boomerang Thrower near the start. Make sure you get a 2/3 mortar before round 12. Get a few 3/0 and 2/3 Boomerang Throwers. If you can, upgrade the Spike-o-Pults to Juggernauts. Then spam lots of MOAB Maulers (0/3 or 2/3 Bomb Towers) near the start and a couple of 4/2 Bomb Towers (Bloon Impact) near the middle. Also get a couple more 2/3mortars for camo detection and then start getting even higher income by sending out grouped pinks (hotkey 5) and then use your extra money to spam even more MOAB Maulers. Once you can't fit any more on the screen, upgrade your MOAB Maulers to MOAB Assassins (2/4 Bomb Towers) and then start getting Glaive Lords (4/2 Boomerang Thrower). Your plan is to outlive your opponent.

A video is linked to this showing 2 players with 6,000 going at it.