Abstract: Sights of the present disclosure comprise a housing supporting an optical sighting element, such as one or more lenses or iron sights. A first lateral side of the housing has a laterally-extending protrusion and a lead-in portion forward of the laterally-extending portion. In some arrangements the lead-in portion is laterally-inward of an outermost surface of the laterally-extending protrusion and has a surface roughness of less than 50 ?m. In some instances, the laterally-extending protrusion has a width of at least 1 mm and the lead-in portion has a length of at least five times the width of the laterally-extending protrusion.

Abstract: A set of cards for playing a game is provided. Each card has items selected from a predetermined category printed thereon. The category is identified on the card and items are arranged in subgroups according to different degrees of difficulty regarding their perceived recognizability as being members of a set falling within the category. A board which may be used for playing a game using the cards is also provided.

Abstract: Apparatus for playing a game comprises a board and plurality of playing pieces for placement on the board during play of the game for tracking the progress of the game. The board is demarcated into a number of playing areas. Each playing area is subdivided into a plurality of abutting playing spaces. The playing areas are arranged in partially overlapping relationship so that the playing areas have at least some of the playing spaces in common. A set of cards for playing a game is also provided. Each card has a number of items selected from a predetermined category printed thereon. The category is identified on the card. The items are arranged in subgroups according to different degrees of difficulty regarding their perceived recognizability as being members of a set falling within the category.

Abstract: A set of cards for playing a game is provided. Each card has items selected from a predetermined category printed thereon. The category is identified on the card and items are arranged in subgroups according to different degrees of difficulty regarding their perceived recognizability as being members of a set falling within the category. A board which may be used for playing a game using the cards is also provided.