Finding matches in this grid is very similar to the logic I used in the match three game, particularly the “Tap to Match” variation.
After shooting a new bubble collision is handled through Box2D and the 2D circle colliders in each of the bubbles and the bullet.
In a bubble shooter game, just like in a match three game the level of difficulty comes from how easy it is to find good matches.
Just a reminder of what the “real” Aquaman looks like (at least to me). The lamest superhero ever!