Players: Two

Players take turns in marking squares on a grid. The first player unable to move loses.


The game is played on a grid; 6 x 6 is a good size. One player is 'O' and the other is 'X'.

The players take turns in writing their symbol in an empty cell. Placing a symbol blocks all of the neighbouring cells from both players, and you can optionally indicate this by shading them:


The first player unable to move loses.


For example, in the following game the second player 'X' wins because 'O' has nowhere to play:


Other topics

Strategy and History

Other games like Obstruction: Chomp

Play Obstruction

Your name:

Size of grid: 6 x 5  6 x 6  7 x 6  8 x 7  8 x 8 

Do you want to play first? Yes  No 

BlogRSS FeedAbout Pencil and Paper GamesContact Us