999SLHastur is a vertical puzzle matching mobile game that combines layered occlusion, observation recognition, and precise tapping. Players face a board of overlapping symbolic tiles, and can only tap tiles that are fully exposed—not completely covered by upper layers—to match pairs of identical patterns and eliminate them, gradually uncovering the target hidden beneath. The board contains common symbols like lantern fungi, crystal clusters, coiled leaves, bell charms, and comet glows; clearing them is necessary to find the pair of sacred geese concealed among them. Successfully matching the sacred geese advances the level and earns points, while tapping a wrong pattern counts as a mistake; three mistakes end the round. As levels progress, the number of columns, rows, and layers increases, making the board more crowded and the overlaps more complex, requiring calm observation of outlines and careful order planning. The controls are intuitive and the pace tight, offering both easy entry and strategic depth.