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A program in Karel is used to control a simple robot named Karel that lives in an environment consisting of a grid of streets (left-right) and avenues (up-down). Karel understands five basic instructions: move (Karel moves by one square in the direction he is facing), turnLeft (Karel turns 90 ° left), putBeeper (Karel puts a beeper on the square he is standing at), pickBeeper (Karel lifts a ...
This is an accepted version of this page This is the latest accepted revision, reviewed on 20 January 2025. Video game series Tetris Tetris -like games have been created on a large variety of platforms, including TI-83 series graphical calculators. Genre(s) Puzzle Developer(s) "Various" with supervisor for The Tetris Company Publisher(s) Various Creator(s) Alexey Pajitnov Platform(s) Various ...
A solution to MacMahon Squares with the largest single-color area [3] MacMahon Squares is the name given to a recreational math puzzle suggested by British mathematician Percy MacMahon, who published a treatise on edge-colouring of a variety of shapes in 1921. [4] This particular puzzle uses 24 tiles consisting of all permutations of 3 colors ...
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The MacMahon Squares game is an example of an edge-matching puzzle. The family of such problems is NP-complete . The first part of New Mathematical Diversions describes these games in general, starting with linear forms ( dominoes ), then progressing in detail with similar games using tiles shaped as equilateral triangles, squares, right ...
CodeHS was selected as one of three education technology companies to take part in the 2013 Innovation Challenge, part of the NBC Education Nation initiative. [6] Innovation Nation challenge participants CodeHS, Teachley, and GigaBryte participated in a series of challenges in October 2013, culminating in a live pitch contest broadcast live on NBC during the Education Nation Summit.
If there is a square consisting of two black cells and two unknown cells, at least one of the two unknown cells must remain white according to the rules. Thus, if one of those two unknown cells (call it 'A') can only be connected to a numbered square by way of the other one (call it 'B'), then B must necessarily be white (and A may or may not ...