Normal sudoku rules apply. Along each line, the hexagon is referred to as 'position 1', the next cell along is 'position 2' and so on. Digits never repeat along a line. PURPLE LINES are thermos. Digits along thermos always increase as you move away from the hexagon. Eg: 24579 would be a valid thermo. TURQUOISE LINES are index lines. On an index line, the digit in the Nth position indicates the position along the line where the digit N appears. Eg: 32154 would be a valid index line. The 3 in the 1st position indicates there is a 1 in the 3rd position, and so on. LIGHT BROWN LINES are hitlines. Digits can be in any order on a hitline, but the digit in the hexagon indicates how many digits along the hitline match their position number. Eg: A hitline might read 27315. The 2 on the hexagon indicates that exactly two digits match their position number; in this case, 3 in the 3rd position and 5 in the 5th position. SHENANIGANS: One of the digits 1-9 (to be determined) is the 'mischief digit.' Every line follows one (AND ONLY ONE) of the three line rules above, but any line containing the mischief digit has been painted the wrong colour. (Any line NOT containing the mischief digit is the correct colour.)