The present invention relates to a puzzle, and in particular to a light puzzle which incorporates a plurality of lights and a plurality of switches, in which activation of a switch causes the light pattern to change in a manner dictated by electronic control means, whereby an interactive game is provided.

Existing puzzles of this general type include a two- dimensional array of lights, where a user can turn on or off individual lights and in response to the switching action, the processor turns on and/or off a further pattern of lights. These puzzles suffer the disadvantage because they are two-dimensional there is always an "edge" to the light array at which a different scheme or set of rules to solving the puzzle will apply.

A puzzle comprising a substantially spherical or polyhedral housing comprising a plurality of lights disposed over the surface thereof, a plurality of switches selectively operable by a user, and control means operatively connected to said switches and to said lights for switching on or off lights in response to operation of a selected switch.

Arranging the lights on the surface of a sphere provides a particularly challenging puzzle where a light pattern game can be played over the entire sphere or polyhedron surface.

Preferably, the puzzle has twelve lights disposed evenly over a spherical or dodecahedral surface. If polyhedral, the housing is preferably a regular polyhedron with lights arranged on respective faces.

In the preferred embodiment, the lights comprise light emitting elements, and said switches include regions which constitute buttons which are depressed by a user to operate the switch and are at least in part formed of light- translucent material, with the light emitting elements being disposed beneath respective buttons. Each switch includes a generally cylindrical light-translucent actuator, an upper surface thereof constituting a said button, at least a lower region thereof being seated in a cylindrical socket such that a degree of relative movement is allowed. In this way, the user is actually depressing the lights or part of the lights to operate the game.

A contact switch is disposed between the movable actuator and the cylindrical socket which is actuated as the button is depressed. The light emitting element is preferably a light emitting diode. Audible indicating means may be

provided which are activated in response to a signal from said control means. The control means is preferably a microprocessor programmed to operate the lights to provide a game.

Embodiments of the present invention are now described, by way of example only, with reference to the following drawings in which:

Figure 1 is a view of a puzzle in accordance with a first embodiment of the invention from above; Figure 2 is a side view of the puzzle; Figure 3 is a schematic cross-sectional view taken along the line III-III of Figure 1; Figure 4 is a schematic cross-sectional view taken along the line IV-IV of Figure 1;

Figure 5 illustrates diagrammatically electronic circuitry employed in the puzzle;

Figure 6 illustrates a puzzle in accordance with the second embodiment of the invention in which the housing is of polyhedral shape, when viewed from above; and

Figure 7 is a side view of the puzzle of Figure 6.

The puzzle 2 in accordance with a first embodiment of the invention as illustrated in Figures 1 to 4 comprises a spherical shell 4, which in the figures is shown slightly

flattened in order to allow more of the surface of the puzzle to be seen. The shell 4 comprises upper and lower shell halves 6, 8 formed preferably of plastics material, which are permanently joined along line 10 by adhesive, or by a welding process.

Distributed over the surface of the puzzle are a plurality of lights 12, 12A, 12B. The illustrated example shows twelve lights, which is a convenient number which can be evenly distributed over the surface of the sphere, but other numbers of lights could be employed. For example, twenty is the next number which geometrically can be evenly distributed. It is important that in any orientation of the puzzle at least one light faces the user. Alternatively, there could be minor variations in spacing between the lights, in which case other numbers of lights may be employed. In the illustrated embodiment employing twelve lights, ten of these are identical and are indicated by the numeral 12 whilst the remaining two, indicated 12A and 12B include certain minor structural differences as discussed below.

Each light 12 includes a concave reflector element 13 which sits in a circular aperture 11 in the shell 4 and which is highly reflective on its concave surface. A base region 14 of the reflector element 13 defines a cylindrical socket

15. Seated in this socket 15 is a generally cylindrical switch actuator 18. The base of the actuator 18 supports a circuit board 16 which carries a light emitter 20, which is preferably an LED, but might also be a conventional filament bulb. A part-spherical lens 22 overlies the reflector 13 and includes a circular aperture 23 through which an upper region of the actuator 18 protrudes. This upper region constitutes a button 25, which is depressed by a user during play of the puzzle to operate a switch, as described further below. The actuator 18 is formed of a clear plastics material, although the inner conical surface 27 may have a roughened light-diffusing surface. The lens 22 may be clear or may have a slightly frosted or moulded surface in order to diffuse the light from the LED. The printed circuit board 16 carries on its lower radially- inwardly directed surface a tap switch or dome switch 24 which abuts a protrusion 26 on the radially-outwardly directed basal surface of the socket 15. The actuator 18 is movably held by the socket 15, so that this can be depressed by a user relative to the shell 4 and lens 22, so that the switch 24 is activated. Only a small degree of movement is required.

As referred to above, the light 12A has a different construction from lights 12. As can be seen in Figures 3 and 4, the actuator 18, LED 20, printed circuit board 16

and switch 24 are of identical construction as those parts of lights 12 with similar reference numbers; however, the reflector 13A is integrally formed with a battery housing 29 which houses a pair of AAA-sized batteries 28. The housing 29 sits within a chamber 30 which is integrally formed with the upper shell half 6. A lower region of the chamber 30 is connected to an upper or inward end of a support 32 which is integral with the lower shell half 8, by means of screws 34.

The upper reflector 13A is removably mounted in its reflector seat by means of screws 36.

Figure 5 shows schematically the circuitry employed in the puzzle. This includes a central processing unit 38 (CPU) which may be a Samsung type, such as a KS 57C 0002 microprocessor, or may be a similar Sanyo or Soki type.

The switches 24 are each operatively connected to the central processing unit 38, these constituting a "key matrix input" to the CPU. An oscillation circuit 40 provides clock control for the CPU 38. The outputs from the CPU go to the light emitting diodes 20, and to a buzzer or loudspeaker 42 which is used to give an audible indication to a user, for example to give an indication of activation of individual switches or to give an indication that the puzzle has been switched on, or that the puzzle

has been solved. The CPU 38, oscillation circuit 40 and buzzer or loudspeaker 42 are disposed inside the shell 4 on a wall of the chamber 30.

The puzzle may be arranged so as to be turned on by depressing a particular button designated an on/off button, or by simultaneously depressing oppositely disposed buttons. The CPU is programmed with a "resume" function so that the pattern existing the last time the puzzle was played will be recalled to allow a game to be resumed. If any pair of adjacent buttons are depressed the game will clear, and a new game will commence with either a pre¬ determined or a random geometric pattern of lights established. The user sequentially depresses buttons, which give rise to changes in the overall pattern of lights which are lit, in an attempt to achieve a particular desired overall pattern of lights. For example, in one game it is an object to reach a condition where all the lights are on. The CPU is programmed to produce a random pattern of lights when a new game is commenced. As a particular button is depressed, the light associated with that button and the surrounding five lights will reverse, so that if they were originally on they will turn off, and if originally off they will turn on. The user presses individual buttons in turn in an attempt to reach the desired condition in which all the lights are on. An auto-

off facility may be provided to turn the puzzle off if no button is depressed for three minutes. The control logic responds identically relative to a selected light irrespective of which light is selected so that there is no "edge" to the game.

A variety of other games may be programmed in the CPU, which may be accessed by repeatedly depressing a pair of adjacent buttons. For example, game number two is activated by pressing a pair of buttons twice.

In an alternative puzzle illustrated in Figures 6 and 7, instead of a spherical housing a housing 2' is provided which is in the shape of a regular polyhedron, in this case a dodecahedron or twelve-sided solid. Lights 12', 12A' , 12B' are evenly disposed over the surface of the housing, with one light being arranged on each face of the dodecahedron. As can be seen in the Figures, the lights will protrude slightly above the respective faces. In all other respects, the structure of this embodiment is identical to the spherical puzzle.

The puzzle housing may alternatively be shaped in the form of other non-regular polyhedran with one light arranged on each face, although is more pleasing in the form of regular polyhedran, having identical faces. The next highest

number of faces for a regular polyhedron after 12 is 20.

The puzzle is able to provide a variety of different games which are conceptually pleasing particularly owing to the overall symmetry, and which despite the simplicity of individual switching operations are extremely challenging. The symmetry of the puzzle means that regardless of orientation the puzzle looks substantially the same; with the puzzle illustrated having twelve lights a central light facing the user is evenly surrounded by five other lights. This allows games to be played in which an identical predetermined sequence of light-switching operations can occur regardless of orientation. The puzzle does not therefore have any "edges" or boundaries at which the logic is discontinuous.