Every hidden symbol becomes part of the network.
Each level opens with a grid of face-down tiles, each concealing one half of a matching pair. Tap or click a tile to reveal its symbol, then select a second position and compare the two.
Matching symbols are resolved and removed from the active puzzle, moving you closer to a completely cleared board.
When the symbols do not match, both tiles return to their concealed state. Their positions are still useful information, however, and can guide later decisions when their partners appear.
As progression continues, grids become larger, symbol designs become more intricate and the overall pressure of keeping more positions in mind becomes stronger.