With microprocessors now ubiquitous, the computer systems inside trendy slot machines allow producers to assign a different probability to each image on every reel. To the participant, it would appear that a successful symbol was "so shut", whereas in fact the chance is far lower. Free spins are a standard form of bonus, the place a series of spins are mechanically performed at no charge at the players current wager. Free spins are normally triggered through a scatter of at least of|no much less than} three designated symbols . Some games allow the free spins bonus to "retrigger", which provides extra spins on high of those already awarded.