Novice:
If you're new to the game try this. A sequence length of 3 with 3 possible icons.

Standard:
The original Mastermind difficulty level. A sequence length of 4 with 6 possible icons.

Super:
The more challenging Super Mastermind difficulty level. A sequence length of 5 with 8 possible icons.

Ultimate:
A sequence length of 7 with 10 possible icons.

Or you can customize:

How many Icons?
3   4   5   6   7   8   9   10

How long is the sequence?
3   4   5   6   7