User blog comment:Sam Wang/BTD5 - Tips For Reaching High Rounds/@comment-4275518-20140106210449

To get tons of money, use the double cash feature but weather you do or don't then you want to get as many farms as soon as possible. By round 50, on my 200+ game I had 100k+, just try and get as many farms as you can. For a good defense, 2/3 dart monkeys early game, later game maybe 2/0 super monkeys or 4/2 ninja monkeys. Try to get spike storm to do damage to MOAB bloons across all the map, and enough 2/4 monkey aces to clear the map of ZOMGs. 2/4 ninjas are also pretty good, since eventually ZOMGs can get faster than pinks.