![]() Using the ball nosed bit in a standard router, together with some well placed stops, can give you the perimeter groove. You could also use a drill press, which would give you good depth control too. I did an experiment where I used the ball nosed bit in a hand-held drill and was able to get good results making wells for the wooden balls. The SVG file is a 1:1 scale drawing and can be printed off and attached to the board blank to be used as a guide. The SVG file here contains the vectors needed to generate your own machine code, however, if you don't have access to a CNC machine there are other ways to make this relatively simple design. I used a 1.5 mm endmill to make some dividing marks to show the 3x3 sub-regions, and a 3 mm endmill to cut the board away from the stock. ![]() The CNC was fitted with a ball nose bit (12 mm diameter) to make the divots where the balls will sit. I did some experimenting with the ball nose bit chucked in a hand-held drill and got some satisfying results.Īs mentioned earlier, I used a CNC router to make my board, but there are other ways. I used a CNC router with a ball nose bit to make the board, but it really is a simple design and can be made by other means. You'll need some clamps and some wood glue. You'll need a pencil and straight edge, as well as a saw to cut the plank into three equal sections. You will need 9 different and easily distinguishable colours. It paints well onto wood and gives a satisfactory finish. I then discovered I could buy blank balls for very little cost the listing can be found here. I considered making my own wooden balls, but making a minimum of 81 balls seemed tedious. The wooden balls are 12 mm in diameter and are from a supplier on ebay. I also had a scrap of plywood to make a holder for the wooden balls while I painted them. The board is made from a single plank of pine, measuring 900 mm in length, 90 mm in width, and 15 mm in thickness. With some basic tools and a selection of paints, you can make your own too :) This set was made with a single pine plank and some wooden balls purchased from a seller on ebay. I can then just print off my puzzles and not have to worry about the colour/number mapping system. This is how I've been playing so far, but I now have an ambition to code up my own Sudoku puzzle generator that will output in colours. As long as you keep consistent colour/number mapping the game can be played. You can play the Rainbowku (I know, terrible portmanteau) by obtaining any Sudoku starting puzzle (widely available online) and assigning colours to the numbers. There are approximately 6.67E+21 (that's 667 with 19 zeros after!) unique solutions to the Sudoku puzzle!! It has also been determined that the minimum number of clues possible for a proper Sudoku is 17, with over 49,000 of these solutions found! The game of Sudoku has been somewhat of an obsession for many mathematicians, although it has taken a number of variations and names throughout history. Sudoku is normally played with the numbers 1-9, but you can have more fun by replacing numbers with pretty colours! Also, bringing the game off the page and into 3D space makes for more collaborative puzzle solving! Try leaving an unsolved puzzle out for people and see how no one can resist having a go! I've always wanted to make a colourful Sudoku game and the Instructables Rainbow contest was the perfect excuse to get the paints out and fire up the workshop!
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