Portable game apparatus with acceleration sensor and information storage medium storing a game progam

A storage medium to be loaded on a portable game apparatus having a display to display game scenes, a housing to be gripped by a hand of a player and arranged with said display on a surface thereof, a processor, and stored information to be processed by said processor, comprising:

• an acceleration sensor output read program for reading an output value of said acceleration sensor;
• a neutral position set program for setting a reference tilt of the portable game apparatus;
• a write program for writing as neutral position data to a temporary storage memory a corresponding output value of said acceleration sensor to the neutral position;
• a correction program for correcting the acceleration sensor output value by said neutral position data;
• and
• a game control program for changing a display state of the game scene to be displayed on said display based on an output value of said correction program.

A portable game apparatus having a display arranged on a surface thereof, comprising:

• a game map data storage for storing game map data to display a game map as a background image on said display;
• a game character data storage for storing game character data to display a game character on said display;
• an acceleration sensor for detecting acceleration in response to movement or tilt of said portable game apparatus;
• a neutral position setter for setting a reference tilt for said portable game apparatus;
• a program storage for storing program data to move and display the game character depending upon at least a tilt direction detected by said acceleration sensor;
• and
• a processor for displaying a game image on said display such that a display state of said game character is changed based on an output of said acceleration sensor, said reference tilt and said program.

An information storage medium to be used on a portable game apparatus including a display to display game scenes, a housing to be gripped by a hand of a player and arranged with said display on a surface thereof, a processor, and stored data to be processed by said processor, comprising:

• a game map data storage for storing game map data to display a game map as a background image on said display;
• a game character data storage for storing game character data to display a game character on said display;
• an acceleration sensor for detecting movement or tilt of said portable game apparatus;
• and a neutral position setter for setting a reference tilt for said portable game apparatus;
• a program storage for storing program data to move and display the game character depending upon at least a tilt direction detected by said acceleration sensor, wherein
• said processor performs processing based on an output of said acceleration sensor, said reference tilt and said program thereby controlling a game image displayed on said display such that a display state of said game character is varied depending upon detected acceleration.