Abstract: Grid authentication factor is about XY coordinate lookup system. The random cell in the grid carries the correct combination of numbers and letters in the cell. An example of grid authentication scheme is the bingo card. Bingo card is a less secure alternatives because of the scheme it used (the three digits) which is fewer than most random OTP schemes making it exposed to threats. However, grid authentication is one of the interesting authentication scheme that can be explored to maximize the random generation of codes with mathematical computation and algorithmic scheme. This study aims to compare the different grid authentication scheme to determine which of these schemes provides better performance, complexity, saves memory resources and gives quality key generation.