PURPOSE: To enjoy pocket billiards without horizontally installing play fields by providing a target ball play field and a hand ball play field on a slope and blocking target balls and hand balls from going into the respective fields with a target ball intrusion blocking means and a hand ball intrusion blocking means. ;CONSTITUTION: A target ball play field 20, where a target ball B2 rolls, and a hand ball play field 10, where a hand ball B1 rolls, are provided on a slope 1 at the upper part of a casing C for a ball game system GS 1. Besides, a step 30 for blocking the target ball B2 from going into the hand ball play field 10 and a transparent partition plate 40 for blocking the hand ball B1 from going into the target ball play field 20 are provided near the boundary of the target ball play field 20 and the hand ball play field 10, and a collision area 50 is provided so that the target ball B20 the intrusion of which is blocked by the step 30, can collide the hand ball B1. Then, a pocket 60 is provided in the target ball play field 20 and the hand ball B1 is hit by moving a hammer 70 forward or backward with a solenoid.;COPYRIGHT: (C)1996,JPO
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