∞ is a 25-round Special Mission taking place at the End of Infinity. In this mission, you have infinite money, so you can build your army as large as you want. But the more you buy, the harder the mission will get. The difficulty of each round is calculated by %CRBE/s (% Cost Red Bloon Equivalent per second), which can be shortened as |∞ (made up symbol, pronounced "valinfi"). A |∞ means the number of RBE that appears every second is equal to 1% of the total cost of all your towers and upgrades (for example, if all your towers and upgrades cost 10000$, and the difficulty of the round is 10|∞, then every second, the number of RBEs that will appear is 10000*10% = 1000 RBE/s.) The bloons with the most RBEs will take priority (for example, if the difficulty is 5 RBE/s, a pink bloon will appear