ColorSort

"Gameplay:
First, tap the colored block you want to move, then tap the destination where you want to place it. Once these two steps are completed, the three matching colored blocks will align and disappear. Note that you can only select the topmost blocks; tapping blocks underneath will not trigger any action.
Additionally, you must continue to uncover hidden blocks—a challenging task that requires persistent exploration. At the same time, make sure to leave yourself enough room; it is best to keep at least one empty space available."