Tokens () are the currency in Bloons TD 5 Mobile and Steam used to purchase and upgrade the Monkey Lab. The player can obtain Tokens by completing tracks including Extreme Tracks or reaching round 99 (tested on Android) on a track. The player does not receive tokens for beating the same track on the same difficulty for a second time, but the reward for reaching the round 99 is repetitive. The amount of tokens the player can earn in a level depends on the track played and the difficulty played on. It is also possible to receive tokens from Odysseys and Boss Bloon events.
Although the player does not receive tokens for beating the same level on the same difficulty twice, they do receive a token if they beat round 101 on a level of the same difficulty twice. This is useful for getting small amounts of tokens without playing new levels.