A game system includes a housing to be held by a player. The housing incorporates an XY-axis acceleration sensor to detect an acceleration in a X-axis direction and a Y-axis direction and a Z-axis contact switch to detect an acceleration in a Z-axis direction. The sensor and switch detect at least one...http://www.google.de/patents/US7601066?utm_source=gb-gplus-sharePatent US7601066 - Game system and game information storage medium used for same
