A large sports field with a sand pit to the top right of the screen for sports like long jump and a large running track that takes up a large portion of the screen. Surrounding the monkey-made constructions is typical grassland with flowers dotting it.
The bloons follow the track by entering into the top right circle next to its innermost rim of this circle (indicated by the yellow arrow directly on the map itself), going to the bottom right circle, the top left circle, the bottom left circle and finally to the exit at the outer rim of the top right circle again indicated by the yellow arrow pointing outside the map.
There is also a digital timekeeper on the right side that denotes the total time played on the track from 00:00 in minutes and seconds, up to 1 hour (minus speedups); after 1 hour, the clock resets to 00:00 again. It is affected by speeding up the game, though, so it won't accurately show the time it took for someone to play the track.
- Main article: Four Circles/Strategies
- Up to 48 Banana Farms can be placed on this track.
- This is similar to Sprint Track in Bloons Tower Defense 5.