The Bloon Solver is the final upgrade of Path 1 for the Glue Gunner in BTD6. It allows the glue fired to dissolve bloons much more quickly. It also allows the Glue Gunner to fire much more quickly, as gaining a powerful Glue Splatter ability that allows it to hit up to 12 bloons. However, it can only hit 1 MOAB-Class Bloon at a time. It also gains a massive fire-rate boost, roughly a x4 boost.
It costs $20,400 on Easy, $24,000 on Medium, $25,920 on Hard, and $28,800 on Impoppable.
It is highly recommended to buy the 5-0-2 Glue Gunner instead of the 5-2-0 Glue Gunner, because the Bloon Solver shoots so fast and already has the capability of splatter bloons, only making the glue last longer on MOAB Class Bloons would be more effective doing more damage.