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

Seems like a handful, don't it? Leave it to a genius (sounds more like "mad scientist" to us) to make us get a brain workout. If you like numerical puzzle games such as Sudoku, give Nurikabe a spin. It won't disappoint.

Hot on the heels of Sudoku, Dr. Tetsuo is back with Kakuro, the crossword puzzle with numbers for mobile phones. Think of it as Sudoku for the people who can count. This time, you just can't get by with logical reasoning, you actually have to know how to add numbers up.

Instead of sentence clues, you're now presented with number clues. You have to enter digits into each column and row so that their numbers add up to the sum presented by the corresponding number clues. You can only use digits from 1 to 9 and you can't use the same digit twice in the same column or row.

Too difficult for you? Don't worry, Dr. Tetsuo will be there to help you along the way, as always. He's made some helpful options available like pencil marks and row/column highlights. You'll also be informed if the numbers don't add up or a duplicate digit appears. You can also choose to view all the possible combinations of digits for the highlighted number clues.

Kakuro features three difficulty levels, as well as the option to make your own Kakuro board. If you're one of the gifted number crunchers around, then you'd probably have the best time record, which is saved for gloating purposes.