Nurikabe is a square-painting numerical puzzler from Breakpoint. The premise of the game is this: Dr. Tetsuo's lab need is in need of renovation. Genius that he is, Dr. Tetsuo can't help but make a menial and tedious task more mind-boggling than it usually is, so he came up with the idea to repaint his lab according to the rules of a game called Nurikabe.

The player gets a board of empty squares with a few numbers scattered about. The object of the game is to paint all the squares either white or blue, using the following rules:

• The numbers are islands which show how many white squares make up the island (including the number square)
• The islands can form any shape
• Islands cannot touch (the white square of one cannot touch the side of the white square of another)
• The islands must be separated by blue squares which must form one continuous wall (every blue square must touch the sides of at least two other blue squares)
• Blue squares cannot form a block 2x2 or bigger
• There is only one solution