The present invention relates to a set of construction elements comprising a plurality of flat plates (1-10) of a constant thickness (v), each plates having a central part (K1-K10) with a planar figure defined by linear edges in top plane view, said plates being made of a material of high static friction, and wherein along at least one peripheral edge of the central part (K1-K10) of the plates (1-10) a plurality of teeth (42) of constant width (sz) laterally projecting therefrom and a plurality of toothless sections (43) are alternately arranged in a manner that while moving round the circumference of said plate (1-10) in any direction, each one of the edges which comprises teeth starts with a tooth (42) and ends with a toothless section (43), or vice versa, and wherein each one of the teeth (42) is in the form of a body having edges orthogonal to the edges of the planar figure forming the respective central part (K1-K10).

Game piece in the form of a polyomino or polycube or similar, consisting of a number of blocks (5) that are put together in an orthogonal pattern, characterized in that the game piece (4) comprises at least two parts (6) that are each formed by a number of aforementioned blocks (5) connected together in a fixed way, whereby these parts (6) are slidably coupled with respect to one another in such a way that they enable a number of forms of game pieces (4) to be formed with the game piece (4) concerned.

A hand held electronic device (10) including an air mouse unit for communicating with a remote host device (30) having a display screen (32) on which a cursor is displayed, wherein during operation as an air mouse the movement of the device controls the movement of the cursor, the device comprises an elongated body (11) with different surface regions accessible by a finger of the holding hand, and in one accessible surface region has a control field (35, 36), and a touch sensor (23, 24) is arranged under the control field (35, 36) that senses when the control field (35, 36) is touched by the finger and when the finger is moved thereon, and the air mouse unit has a deflection control unit (27) controlling the speed of the cursor movement in response to a unity movement of the device, and a processor (43) is connected to the touch sensor (23, 24) that controls the deflection control unit (27) to increase or decrease the speed of the cursor control in response to a predetermined first finger movement. The device can be complemented with a direct data entry function using a different surface region and with a conventional mouse function using a further different region.

A three-dimensional jigsaw puzzle consisting of one or more two-dimensional puzzle parts, each consisting of two or more jigsaw puzzle pieces. The puzzle parts can interconnect using leg and hole connectors to form the three-dimensional object. Each puzzle part is fixed using fixing sheets which are precut to match the format of its corresponding puzzle part. Each puzzle part can have puzzle pieces which can be bent to create corners. The bending is achieved by applying a reinforced tape along the bending line on the inner side, and by having a straight cut on the outer side of the corner penetrating the cut through the puzzle piece, but without cutting the tape. The puzzle pieces are laminated with paper that can bear an image on both sides. The puzzle parts can have a reinforcement bar glued on the non-visible side so that they retain the desired planar shape.