Prismoo

It's a "Rainbow Ranch Expansion" game mode. Players start from the top left corner, click on the colored dots at the bottom to change the color of connected ranch areas and merge adjacent tiles of the same color, expanding the entire board into a single color within a limited number of moves. There are 99 levels in total, with the board size and number of colors gradually increasing; it includes unlocking, star ratings, save data, tutorials, settings, and a results page.