Has a coding flaw. After you win the first round the colors of second and third row get swapped in how they show up when selected which makes using the app difficult at best. You select white and it puts down yellow, you select yellow and it does white.
It works fine the first round but always switches on the second. I tried it several times to be sure it wasnt just a fluke and it did it every time.
Yirmin about Code Breaker Toolbox