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In the game Mr. Gun you will have to participate in duels with many opponents. You will always get the first shot, but if you miss, your opponent will not miss the opportunity to get even and will shoot you. For each victory, depending on the difficulty, you get a reward. With the money you accumulate you can buy new weapons, which will increase the chances of hitting the target.
You and your opponent are on different levels, so you need to accurately calculate the trajectory of the bullet. Your aim is aimed while the opponent is still walking. After he stops, you need to make a shot. If you hit, then go further, where on a new floor another enemy will approach you. This will continue until you gain the necessary amount of points to move to another level. During the transitions you can buy weapons.