SayiBul is a game of reasoning and logic in which you try to figure out the sequence of four digits of the number that your opponent (Averell, William, Jack, Joe or a "real" friend) has chosen. You can play SayiBul with a friend by using the same computer (hot seat style), or over internet (through TCP/IP connection). Also you have four friends whose talents are gradually different -from newbie (Averell) to probably perfect (Joe)- and who are always ready to compete with you. The game is easy to learn (with the help of SayiBul help files) and funny to play. Also improves fast and logical reasoning skill and makes its players more charming in the course of time, according to some fake scientists..