Abstract: A frame element (8) for forming a grate, including two spaced-apart side members (12,14) and several plate members (6) arranged one next to the other between the side members in longitudinal direction thereof, between which plate members is provided a gas-venting slot (34). The side members (12,14) are formed by two opposing surfaces of a rigid frame (2), and the plate members (6) are each constructed as individual structural parts releasably connectable to the side members (12,14). The plate members (6) are preferably inserted one after the other into longitudinally extending guideways (18,20) arranged on the frame and are spaced apart by spacing projections (30,32), the spacing being necessary to form a gas-venting slot (34).

Abstract: When an entertaining electronic game is played, it is interrupted by an educational game, and can be resumed only after a problem of the educational game is solved by a player. Otherwise, it is interrupted again by the educational game, until the problem is solved.