Board Thread:Questions and Answers/@comment-5797509-20140411212815/@comment-3153244-20140412050711

As the name implies, Premium Upgrades are purchased with real money, but provide you with an easier time playing BTD5. You need to purchase NK Coins before you buy these Premiums.

Money in games are mainly earned from popping bloons and finishing a round. You can also earn them from Banana Farms and Supply Drop Snipers. This type of money is used to buy towers and upgrades to deal with bloon waves, which slowly get tougher.

Monkey Money is earned from the Treasure Chest, completing non-Extreme difficulty maps, Special Missions and Daily Challenges. They are mainly used for Specialty Buildings and Special Agents.