Autumn Onet Connect — autumn tile matching
You look for two matching autumn-pattern tiles on the board and connect them with a line. The line can only go through open cells and make no more than two turns. The same matching logic is used in Tropical Tiles Mahjong, but there the tiles are laid out in a shape, not a straight grid.
Why some pairs won’t connect
A tile can look exactly the same and still be blocked: the path to it runs into other tiles or would need a third turn. That pair becomes available later, once the nearby tiles are cleared. So move order matters more than speed — start with the edges and open areas. You score points for every pair you remove, and the board slowly clears.