[1.] Guess a 4 digit number in 7 attempts.
[2.] Possible digits are 1 to 5. Every digit can appear only once in the number.
[3.] The semafor on the right does not tell you where the correct digits are, just a number of them.
[4.] The meaning of colors:
1
A number of correct digits in the correct spot. One digit is in the correct spot.
2
A number of correct digits but in the wrong spot. Two digits are in the wrong spot.