Online casino software providers are aware that players may switch over to a different game once they get bored with the one they are playing on. It is their endeavor to keep players attracted to the same game for as long as possible. In online slot games one of the tricks that they use is to change the visual appearance of the game. This is often done through the free spins bonus or the bonus game on the second screen.

In most online slots some cosmetic visual changes are made in the free spins bonus. Most often the background color of the symbols is changed from light to dark or dark to light. In some video slots the scene on the background to the reels is changed. A day scene may be changed to a night scene or a summer scene may be changed to a winter scene. In some online slots a different set of symbols issues in the free spins bonus game. The Microgaming online slot titled Moonshine serves as an example. In the main game the old lady is on a rocking chair with a double barrel gun in her hand. In the free spins the rocking chair has fallen down and the lady is drunk on the moonshine. The other symbols show similar changes.

These changes do not create a significant difference and can hold the attention of the player only marginally longer. In some online slots the bonus game on the second screen is used to completely change the reels set so that it appears as if the player is wagering on a different game altogether. The software provider Playtech uses this to effect in its branded slot game Kong- The 8th Wonder of the World. This video slot game has two sets of reels in the main game connected with the progress of the story. King Kong was captured by explorers in the jungles of Skull Island. The first set of reels exhibits this part of the story and is called Jungle Mode. The reels are set in the jungle, the characters from the movie are dressed as explorers and the animations show the scenes from the jungle part of the movie. After the bonus game on the second screen is triggered the online slot game enters the Big City Mode. In the story King Kong is taken from Skull Island to New York City. In the Big City Mode the reels are set in the city, the same characters are dressed fashionably and the animations show the scenes from the city part of the movie.

The Rival Gaming i-slot A Switch in Time follows the same strategy but with three different sets of reels depicting different time eras. The first set of reels depicts the 19th century with symbols like the pocket watch, the gas lamp, the ornate table clock and the wine bottles. Three time machine symbols appearing on the reels trigger the bonus game after which players enter the prehistoric era. The symbols on this set of reels are the prehistoric beasts and the caveman. Again the time machine triggers the bonus game and then takes the players to the future zone. The symbols there are aliens, a radar panel and a spaceship.