Ingenious (board game) board incorporates indentations to hold the players' tiles as well as holes for the scoring pegs. Notably, there is a different tile distribution in the travel version of the game: 2 of each double tile and 3 of every other colour combination, compared with 5 and 6 respectively in the original game. "Einfach Genial Knobelspass" (Simply Ingenious Puzzles), also from Kosmos, uses cardboard versions of the tiles from the original game. The player has one of each of the 21 different tile combinations and for each puzzle must place these in the correct positions on a pre-printed sheet to match
Category of small categories Category of small categories In mathematics, specifically in category theory, the category of small categories, denoted by Cat, is the category whose objects are all small categories and whose morphisms are functors between categories. Cat may actually be regarded as a 2-category with natural transformations serving as 2-morphisms. The initial object of Cat is the "empty category" 0, which is the category of no objects and no morphisms. The terminal object is the "terminal category" or "trivial category" 1 with a single object and morphism. The category Cat is itself a large category, and therefore not an object of itself.