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By far the most common bonus feature in the world of slots is the free spin. This is a pretty straight forward bonus: you spin, you hit a certain combination that gives you a free bonus spin and then you spin again. This is by far the most common bonus you will find, and it is estimated that roughly 50% of all video slot machines include this special bonus feature. (Bonus features are something that come only with video slots, as it is hard to do the special bonus programs with the traditional reel slot machine that is all but an anachronism these days anyway).

Something else found commonly in bonus feature slots is the bonus round. This is a special round where you can increase your winnings if you are able to get certain combinations in a row. Many of the special features you are going to find involve a sort of multi-level experience, where you make your way through the rounds to see just what sort of payout you can get. These can often be much more exciting than the traditional slot game where you simply spin the slots, get the result and then its over.

You might also get a special bonus game with bonus feature slots machines. These are special games that are not slots at all although they are built into the slot machine. For example, you might get a chance to play a game such as Pick the Box (where you have to pick the box to determine what your prize is) or Wheel of Fortune (taking its inspiration from the famous Wheel of Fortune game).

One of the great things about bonuses in slot machines is that you don't only have to look for them in video slot machines in casinos. Most online casinos will also offer bonuses with their slots: some casinos in fact base their entire gaming line-up behind the idea of bonus slots. With the power of the Internet you can now play all of your favorite slot games as well as all of your favorite bonus slot games without even leaving the comfort of your own home. What could be better?