Bloons TD 6 is a tower defense game in which players place various monkey towers along a path to pop waves of balloons ("Bloons") before they reach the exit. The sixth entry in the Bloons Tower Defense series, it features 3D graphics viewed from a bird's-eye perspective and introduces Hero units that level up over time. Towers have three upgrade paths with a maximum of five tiers each, allowing for varied strategic builds. The game supports solo play and up to four-player co-op, and includes Boss Events, Paragon upgrades, and paid expansions adding roguelike and story-driven modes.