This is fully playable Mastermind. You can play it alone - the code will be generated randomly - or with another person who will take the role of the Master.

The goal of the game is to break a secret code. The code consists of 4 colored blocks. There are six possible colors and they CAN repeat. The hacker has 8 tries. Every time he confirms his guess, he is provided with a visual feedback. Each red block means that one of the blocks in the guess is of correct color and position. Each white block means that one of the blocks in the guess is of correct color but in a wrong position.

The in-game manual explains everything. Just download it and play!