This is the thirteenth in a series of themed mystery caches by 
The posted coordinates will put you at an entrance to the Bendigo Regional Park. You will need to solve the puzzle below to find the exact coordinates of the cache hidden there. You will be searching for a screw top container containing log, pencil and swaps.
HISTORY OF MASTERMIND
It is said that Mastermind was invented in 1970-71 by Mordecai Meirowitz, an Israeli postmaster and telecommunications expert. However, it is really just a clever readaptation of an old game played on paper called 'Bulls and cows'.
The idea of the game is for one player to guess the secret code chosen by the other player. The codebreaker has to try and guess the pattern of coloured code pegs that has been chosen by the codemaker, duplicate colours are allowed. Each guess is made by placing a row of code pegs on the decoding board. Once placed, the codemaker provides feedback in the form of black and white key pegs. A black key peg is placed for each code peg from the guess which is correct in both colour and position, a white peg indicates the existence of a correct colour peg placed in the wrong position. If there are duplicate colours in the guess, they cannot all be awarded a key peg unless they correspond to the same number of duplicate colours in the hidden code. The positioning of the key pegs has no bearing on the position of the code pegs. The grey areas of the board are empty.
The game below should give you enough clues to guess the secret code ABCDEF and so reveal the location of the cache hidden at S 36° 47.ABC E 144° 17.DEF
You can check your answers for this puzzle on Geochecker.com.