Blobs is played on the lines and intersections of a 12x12 grid; players take it in turn to draw "blobs" encircling one to four adjacent intersections. The board is initially seeded with two to four one-point blobs per player (depending on player count). After that a player places a new blob by drawing a "stem" along a grid line from one of their existing blobs, at the end of which a new blob is placed. The shorter the stem, the larger the new blob. When no players can play the game ends. The blobs score based on their sizes and the player with the most points wins.