Friday, April 27, 2012


Akari is played on a rectangular grid of white and black cells. The player places light bulbs in white cells such that no two bulbs shine on each other, until the entire grid is lit up. A bulb sends rays of light horizontally and vertically, illuminating its entire row and column unless its light is blocked by a black cell. A black cell may have a number on it from 0 to 4, indicating how many bulbs must be placed adjacent to its four sides; for example, a cell with a 4 must have four bulbs around it, one on each side, and a cell with a 0 cannot have a bulb next to any of its sides. An unnumbered black cell may have any number of light bulbs adjacent to it, or none. Bulbs placed diagonally adjacent to a numbered cell do not contribute to the bulb count.



A larger one:



Thursday, April 26, 2012

Monday, April 23, 2012


Arukone, or Numberlink, is a type of logic puzzle involving finding paths to connect numbers in a grid. The player has to pair up all the matching numbers on the grid with single continuous lines (or paths). The lines cannot branch off or cross over each other, and the numbers have to fall at the end of each line (i.e., not in the middle).

 It's one of the Nikoli puzzles. The Nikoli website has four easy examples to play:




Sunday, April 22, 2012

Olympic Rings

This one is for voluntary homework:

There are nine white spaces in the Olympic symbol. Put each of the numbers from 1 to 9 in one of these white spaces, so that each circle has the same total number inside it.

Hint: The answer will be more than ten and less than fifteen.

Saturday, April 21, 2012


The first one is really easy.

The numbers 1 to 4 must be in each row column and group of 4 cells.


1. Not death (4)
5. Half a dozen (3)
6. Every (3)
7. Between thirteen and nineteen (4)

2. Island (4)
3. Document (4)
4. Previous (2)
6. @ (2)