11-11 is a block-puzzle game played on a rare 11x11 board. As with similar block-puzzle games, the player's primary goal is to earn as many points as possible by creating row and column lines on the board using polyomino-style shapes.
This game differs from the rest in several ways. The individual blocks and empty grid spaces feature rounded corners. The game offers a standard blue background with dark blue empty cells. That said, it's also preset with a white background and white cells with light blue outlines. Although many block shapes in the game are tetrominoes, it also features non-standard shapes.
Eleven Eleven's gameplay otherwise matches other games. The player selects one of three shapes below the board. They transfer the shape to an empty cell space on the grid. They continue this process to create the lines. The game then removes each completed line and rewards the player with points. If the player runs out of spaces and moves, they must try to beat their last-best score.
The highest points are rewarded when the player completes more than one line at a time. These combination moves require the player to partially complete multiple lines and then use one shape and move to finish them.