एक पहेली खेल कंप्यूटर नेटवर्किंग में checksum के बंद आधारित है।

In networking, there is a concept known as the checksum. In a checksum, a string of bits is placed into a grid. The rows and columns of the grid are added up. if a row or column adds up to an even number, it is marked with a zero. If the row or column adds up to an odd number, it is marked with a one. This is used to determine if information was properly sent over a network.

In this game you are given a grid with labeled rows and columns, but the actual data is missing. Your job is to fill in the grid to satisfy the row/column conditions. You are scored according to time and bit ratio. If you have a roughly equal number of ones and zeros in your grid, your ratio score will be higher.