Great to have Tex back but now I'm stuck. Day 9, Level 4, Routing Power Cores. I understand the right and left columns and the up and down but how do I get to the one I want to change and not lose the ones that are already correct. What am I missing ??
After playing Whack-a-Mole with colours and columns for several days I realized that I had to go further back in the game to reset the puzzle. thanks for trying to help.