Build a better approach
Flood Shift begins with a mixed grid of six colors. The flooded region always includes the top-left cell. When you pick a color, every flooded cell becomes that color, and any matching neighbor is swallowed into the region. Diagonals do not count. The puzzle is finished when one color owns every cell.
You have a limited number of turns. A turn is one color change, even if it swallows only a single extra cell. That is why the largest visible blob is not automatically the right tap. A smaller color that connects two areas can be worth more than a wide splash that leaves an island in the opposite corner.
Turn information into decisions
Read the board in layers. First, notice which colors already touch the flood. Those are legal growth. Second, notice which color would then touch a new region. Good sequences create options; bad sequences paint you into a pocket. Corners are the usual leftover trouble, so glance at the far edges before you spend a turn in the middle.
If two colors would grow by the same amount, pick the one that also borders a third color you will want later. You are not only filling cells; you are buying the next decision. Counting one step ahead is enough. Trying to memorize the whole solution on a random board is slower than a simple two-turn look.
Practice for consistent results
There are no lives. A failed board is information. Note whether you ran out of turns with a trapped island or with a messy center. Islands mean you ignored connectivity. A messy center means you chased size. The next shuffle is a new test of the same habit, not a different game.
Score rewards leftover turns because leftover turns are proof of an efficient line. A slow perfect fill still teaches the method. Once the method is stable, speed arrives on its own. Name the next color before you tap, then tap only that color.