Biased random sequence generation for making common player believe it unbiased

The players\´ dissatisfaction in randomness due to their biases is the major problem of game\´s development. Many games were complained even though the developper selected a good algorithm to generate the randomness. The aim of this study was to reduce negative feedback from player in randomness due to cognitive biases of players. By analyzed the randomness in players\´ perspective, it was demonstrated that the idealistic randomness is different from the randomness in players perspective. According to the result, the characteristic feature of randomness were defined. Incoperated into pseudorandom algorithm, the natural randomness for players were generated by spacial method. To assure the capability of method and sequences, the evaluation of naturalness were done in the game of "sugoroku". As a result, the natural sequences is natural for player and is able to reduce the dissatisfaction of players in pratical uses.