ok edit. I figured out the yellow numbers mean its in the wrong spot but is one of the combination numbers. What I think might be helpful is if the number is used twice then have it be another color other than yellow. Then at least you have a fighting chance of winning, otherwise the game feels like you got cheated because the very first 2 rounds are always going to be 1234 5678 unless you get lucky on those 2 rows you only get 1, maybe 2 if you're really lucky, guess at the last combo. Otherwise the game is solid and I enjoyed it.
Yea, the wrong spot code baffled me till I ran out of time, but, I don't think you'd ever lose if it didn't work that way. At first I had 5 numbers with 6 lines and you never would lose then I switched to 4 numbers and 5 lines to make it just a little more difficult (sometimes it just ends with a wrong guess at the end), thanks for playing!