Mastermind involves two players: one as the codemaker, other as the codebreaker. People can't play it alone.
The design of the case is not thoughtful enough, while the holes and the pegs are not perfectly fit.
Codemakers may mark the pattern wrongly. The pegs can easily be lost as they are too tiny to grab.
We exclude the case and abolish the manual grading system.
Digital interface displaces the physical one.
Single-player mode and race mode are added, which allow people to play alone and challenge themselves with a time limit. The theme of ice cream parlor makes the game much more fun and attractive.