Knowledge Pack

In Bloons Monkey City, a Knowledge Pack is a package that gives certain monkeys/towers special bonuses that improve their power. A specific number of points in a specific monkey/tower sends it to the next rank, which higher ranks give a more valuable bonus. When a Knowledge Pack is opened, you get four cards, with each card of different value, depending on the rarity. "Common Cards" only give a specific monkey/tower 10 points, "Uncommon Cards" give 30 points, "Rare Cards" give 80 points, while the rarest "Legendary Cards" give 250 points.