Hidden image games

Abstract

A method of playing a game wherein the game has a predetermined period of time as an element of the game. Such method comprises providing a game sheet, the game sheet has a first substrate with an image surface having at least one imprinted hidden image on such surface and a second substrate with an activation surface having an activation medium thereon. The predetermined period time of the game is initiated by contacting the activation surface with the image surface to thereby contact the activation medium with the imprinted hidden image. The activation medium coacts with the imprinted hidden image to develop and reveal the image after the predetermined period of time has expired and to indicate the end of the predetermined period of time in the game.

What is claimed is:  
     
         1 . A method of playing a game having a predetermined period of time as an element of the game, such method comprising: 
 providing a first substrate with an image surface having at least one imprinted hidden image on such surface;    providing a second substrate with an activation surface having an activation medium thereon;    initiating the predetermined period time of the game by contacting the activation surface with the image surface to thereby contact the activation medium with the image surface;    whereby the activation medium coacts with the image surface to develop and reveal the image after the predetermined period of time has expired and to indicate the end of the predetermined period of time in the game.    
     
     
         2 . A method of playing a game having a predetermined period of time as an element of the game, such method comprising: 
 providing a first substrate with an image surface having at least one imprinted hidden image on such surface;    providing a second substrate with an activation surface having an activation medium thereon;    initiating the predetermined period time of the game by contacting the activation surface with the image surface to thereby contact the activation medium with the imprinted hidden image;    whereby the activation medium coacts with the imprinted hidden image to develop and reveal the image after the predetermined period of time has expired and to indicate the end of the predetermined period of time in the game.    
     
     
         3 . The method of  claim 2 , wherein the first substrate is imprinted with at least two inks of the same color, the hidden image printed with one of the inks, wherein one ink is inactive to the activation medium and the other ink is capable of coacting with the activation medium to change color after the predetermined period of time.  
     
     
         4 . A method of playing a game having a predetermined period of time as an element of the game, such method comprising: 
 providing a substrate with an image surface having at least one imprinted hidden image on such surface, wherein the substrate is imprinted with at least two inks of the same color, the hidden image printed with one of the inks, wherein one ink is a non-photochromic ink that is inactive to light and the other ink is a photochromic ink that is active to light and changes color over a period of time when exposed to light;    providing a light source;    initiating the predetermined period time of the game by exposing the substrate to the light source;    whereby the light source coacts with the image surface to develop and reveal the image after the predetermined period of time has expired and to indicate the end of the predetermined period of time in the game.    
     
     
         5 . A method of playing a game having a predetermined period of time as an element of the game, such method comprising: 
 providing a substrate with an image surface having at least one imprinted hidden image on such surface, wherein the substrate is imprinted with at least two inks of the same color, the hidden image printed with one of the inks, wherein one ink is a non-thermochromic ink that is inactive to heat and the other ink is a thermochromic ink that is active to heat and changes color over a period of time when exposed to heat;    providing a heat source;    initiating the predetermined period time of the game by exposing the substrate to the heat source;    whereby the heat source coacts with the image surface to develop and reveal the image after the predetermined period of time has expired and to indicate the end of the predetermined period of time in the game.    
     
     
         6 . A method of playing a game having a hidden image as an element of the game, such method comprising: 
 providing a first substrate with an image surface having at least one imprinted hidden image on such surface;    providing a second substrate with an activation surface;    initiating the development of the hidden image by contacting the activation surface with the image surface;    whereby the activation surface coacts with the image surface to develop and reveal the hidden image for use as an element in the game.    
     
     
         7 . A method of playing a game having a hidden image as an element of the game, such method comprising: 
 providing a substrate with an image surface having at least one imprinted hidden image on such surface, wherein the substrate is imprinted with at least two inks of the same color, the hidden image printed with one of the inks, wherein one ink is a non-photochromic ink that is inactive to light and the other ink is a photochromic ink that is active to light and changes color when exposed to light;    providing a light source;    initiating the development of the hidden image by exposing the substrate to the light source;    whereby the light source coacts with the image surface to develop and reveal the hidden image for use as an element in the game.    
     
     
         8 . A method of playing a game having a hidden image as an element of the game, such method comprising: 
 providing a substrate with an image surface having at least one imprinted hidden image on such surface, wherein the substrate is imprinted with at least two inks of the same color, the hidden image printed with one of the inks, wherein one ink is a non-thermochromic ink that is inactive to heat and the other ink is a thermochromic ink that is active to heat and changes color when exposed to heat;    providing a heat source;    initiating the development of the hidden image by exposing the substrate to the heat source;    whereby the heat source coacts with the image surface to develop and reveal the image for use as an element in the game.