Abstract: Each note is detected from input sound in units of detection time at specific time intervals. Whether or not the player's input sound coincides with a reference melody set for an egg OB selected for causing a character to be created is determined based on the detected notes, and the character set for the egg OB is created when the input sound has been determined to coincide with the reference melody. Whether or not the input sound coincides with the reference melody is determined based on (1) the distribution of the notes included in the input sound with respect to the passage of time, or (2) the total count of each note included in the input sound.

Abstract: An image generation system includes an operation information acquisition section that acquires operation information based on sensor information from a controller that includes a sensor, the operation information acquisition section acquiring rotation angle information about the controller around a given coordinate axis as the operation information, a hit calculation section that performs a hit calculation process, the hit calculation process setting at least one of a moving state and an action state of a hit target that has been hit by a hit object based on the rotation angle information that has been acquired by the operation information acquisition section, and an image generation section that generates an image based on the operation information.

Abstract: A chord type is associated in advance with an attribute of a character. Whether or not a chord is formed is determined from input sound in units of detection time t at specific time intervals, first to third attributes are determined as the attributes of creation candidate characters from the attributes of the characters based on the formation count in chord units, and the creation probability of each of the first to third attributes is determined based on the formation count of the chord of the corresponding type. A character with one of the first to third attributes determined according to the creation probability is created.

Abstract: Each note is detected from input sound in units of detection time at specific time intervals. Whether or not the player's input sound coincides with a reference melody set for an egg OB selected for causing a character to be created is determined based on the detected notes, and the character set for the egg OB is created when the input sound has been determined to coincide with the reference melody. Whether or not the input sound coincides with the reference melody is determined based on (1) the distribution of the notes included in the input sound with respect to the passage of time, or (2) the total count of each note included in the input sound.