Each level has been designed by the developer who can craft interesting and novel puzzles to keep the game interesting as you progress. Maya Bubbles is a perfect example where your goal is to destroy bubbles and unlock mayan keys as you travel across the map. In these games you must pass a series of increasingly difficult levels designed by the game developer. Each time you clear the screen you move to the next level which will have different parameters (for example less health or more bubble colors) to increase the level of challenge. The key difference is that you progress through levels as you play. In Bubble Shooter Levels gameplay is similar to Bubble Shooter.

Keep an eye on your health! Random Levels Five the first time, then four, three, two, one the back to five. When it reaches zero a new row of bubbles is added and health is restored. Every time you miss a shot your health will go down by one. In other games they advance after you fail to make a match for a number of shots. In some games the bubbles will slowly move down the screen for instance in Descending Balls (that one is an older flash game so it will only work on PC). Keep popping bubbles and last as long as you can before you get game over. Here are some of the key variations of bubble shooter game that you will find on : Endless Bubbles

Even if you have a favorite game it is still nice to play a new variations to enjoy a fresh challenge.