Collect the sum of 21 points (Black Jack), by catching bubbles with numbers. But you must catch those bubbles with "Mirror-Catcher". You may control this Mirror-Catcher, by moving the spot by the screen. But the Mirror-Catcher moves in "mirroring direction": if you move the spot to the left - Mirror-Catcher moves to the right; if you move the spot to the top - the Catcher moves down, etc... When the Catcher meets some bubble, it catches this bubble and the its number is summing in the Catcher. You must collect the 21 points this way. If you have 21, you go the the next level. If you receive more than 21 points (Bust), you lose the set and go level down.