You have a board of 10x10 squares and enough tiles to fill it completely. All 100 tiles have a different face on it, there are no duplicate tiles. You place the tiles on the board one by one but you have to match at least one item (face, mouth, nose, hair, eyes) with adjacent tiles (orthogonally).
There is a variant for older players where you give points for each matching item per adjacent tile. Maximum score per tile is thus 4x4=16 points.