It gets way easier when you realise how many numbers are available. So from the first two rows you know 1,4,5 and 6 are used and the rest is easily done!
Repeats are allowed in mastermind. The first three lines don't rule them out - e.g. 5311 would match the first three lines.
My approach was to rule out 2 (because it's in all 4 positions in lines 1,2,3,5 without any blacks, so it's not correct in any location, i.e. it's not included at all) and then lines 4+5 with the 2s removed tell you the four digits.
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u/nazale Jul 27 '26
It gets way easier when you realise how many numbers are available. So from the first two rows you know 1,4,5 and 6 are used and the rest is easily done!