A playing card having a substrate entirely of a first predetermined colour overlaid with a removable surface coating entirely of a second predetermined colour contrasting with said first predetermined colour, said removable surface being sufficiently friable so as to be able to be scratched off by a player in a pattern predetermined by said player to reveal said substrate in said pattern. The scratched playing card uses the high contrasting colors (typically primary and secondary colors) to produce letters or image(s). These cards are interchangeably used in a strategic and non gambling card game often utilising the Stroop effect.

A puzzle building block capable of changing light-emitting areas includes a building block board, a circuit board, light-emitting elements and building bricks. The building block board includes a plate body and connection portions. The connection portions are disposed on the top surface of the plate body. The circuit board is adjacent to the bottom surface of the building block board. The light emitting elements are disposed on the circuit board, and the light emitted from the light emitting elements passes through the building block board via the connection portions. The building bricks are fitted with the connection portions and shield the corresponding connection portions, thereby forming letters or patterns. Therefore, the light emitted from the light-emitting elements can form various letters or patterns on the top surface of the building block board. The present invention also provides a puzzle building block assembly including the above-mentioned puzzle building blocks.

A puzzle building block capable of changing light-emitting areas includes a building block board, a circuit board, light-emitting elements and building bricks. The building block board includes a plate body and connection portions. The connection portions are disposed on the top surface of the plate body. The circuit board is adjacent to the bottom surface of the building block board. The light emitting elements are disposed on the circuit board, and the light emitted from the light emitting elements passes through the building block board via the connection portions. The building bricks are fitted with the connection portions and shield the corresponding connection portions, thereby forming letters or patterns. Therefore, the light emitted from the light-emitting elements can form various letters or patterns on the top surface of the building block board. The present invention also provides a puzzle building block assembly including the above-mentioned puzzle building blocks.

A safe puzzle is configured with deep cutouts inside a base block, and inside the cutouts are respective pegs that are shielded by the surrounding walls. The base block may have multiple cutouts and inside each one is a peg that serves as the puzzle for the child. The cutouts can have a square peg, triangular peg, circular peg, and ovular peg that extends in a vertical direction from a floor of each cutout. A gap between the peg and the cutout's walls surrounds the pegs so that the child and a parent have sufficient space for their hand to manipulate the blocks, such as place the blocks over the pegs and remove the blocks from the pegs. The pegs have a height that is equal to or below the base block's top surface to create a safer environment for toddlers when playing with the puzzle.

A linked sequence of mechanically encoded puzzle pages is disclosed. Each page is comprised of multiple planar layers interconnected to implement the puzzle design of the page. The puzzle of each page must be solved to disengage a latching mechanism enabling the player to turn the page and begin solving the puzzle in the next page. Similarly for the next page, and each succeeding page until the last page, solution to the puzzle by the player will disengage a latching mechanism. The latching mechanism holds the active page being solved by the player to the next page. In the implementation of the invention described in this disclosure the latching mechanism comprises a hooking piece protruding in a perpendicular direction from the planar front surface of the next page, where the hooking piece fits into an opening on the planar back surface of the active page and a blocking piece on the active page is aligned between the hook portion and the exit to the opening, thereby preventing the hooking piece on the next page from disengaging from the active page.

A puzzle kit and a puzzle constructed from said puzzle kit. The puzzle kit comprises a three dimensional substrate having an outer surface, and a plurality of puzzle pieces that cannot interlock. Each puzzle piece has a first surface and an opposite second surface and a thickness defined between the first and second surfaces. Each puzzle piece comprises first attachment means and the outer surface of the substrate defines a plurality of complementary second attachment means, such that the first attachment means and the second attachment means magnetically attach each puzzle piece to the outer surface. The first attachment means comprises a projection extending from the second surface of the puzzle piece. The second attachment means comprises a hole to partly receive the projection.

Described is a board that is operable as a children's book or puzzle with parts that move, slide or turn on one lateral plane to physically change an illustration or part of the item and, as they slide or turn, activate a noise related to the illustration. The board includes a generally planar top illustrative layer. A bottom base layer is attached with the top illustrative layer. The bottom base layer includes a sensor (e.g., light or touch sensor) and sound generation components for generating a sound based upon actuation of the sensor. A moving component is movably connected with the bottom base layer. Finally, the sensor is connected with the bottom base layer and positioned such that moving the moving component from a first position to a second position exposes the sensor to cause the sound generation components to generate a sound.

Disclosed are puzzle devices for production of one or more puzzles. The puzzle devices can include a body and at least one input device. The body can include a plurality of panels, each panel configured to display one or more visual indicators. The at least one input device can include a plurality of panels, each panel configured to display a visual indicator. The at least one input device can move relative to the body to align one or more panels of the input device with one or more panels of the body. The body can further include a plurality of visual output devices configured to generate visual indicators on the plurality of panels of the body.

A linked sequence of mechanically encoded puzzle pages is disclosed. Each page is comprised of multiple planar layers interconnected to implement the puzzle design of the page. The puzzle of each page must be solved to disengage a latching mechanism enabling the player to turn the page and begin solving the puzzle in the next page. Similarly for the next page, and each succeeding page until the last page, solution to the puzzle by the player will disengage a latching mechanism. The latching mechanism holds the active page being solved by the player to the next page. In the implementation of the invention described in this disclosure the latching mechanism comprises a hooking piece protruding in a perpendicular direction from the planar front surface of the next page, where the hooking piece fits into an opening on the planar back surface of the active page and a blocking piece on the active page is aligned between the hook portion and the exit to the opening, thereby preventing the hooking piece on the next page from disengaging from the active page.

A computer device comprising a user interface, a processor, and a graphics rendering component. The user interface is configured to display user actuatable game elements, each user actuatable game element displayed on a respective tile, and to detect user input when a user engages with at least one of said user actuatable game elements in a move. The processor is configured to determine, on detecting the match game condition, whether at least one tile of the respective tiles associated with the at least three actuatable game elements of the match condition has a tile characteristic indicating an attained background appearance and, if so, to modify the tile characteristic of each tile of the respective tiles associated with the at least three actuatable game elements of the match condition not indicating an attained background appearance to indicate an attained background appearance.