One of the more preferred type of slots bonuses is the free online slots where players can collect spins for free or credits to use on any of the online slots within the casino. Some online casinos do restrict progressive games but many do not anymore which can increase your chance of winning larger amounts.
By receiving as little as 10 free you can have quite a few spins on the mega moolah reels where the jackpot starts at a million. That would be an amazing win and if you think it is not possible, well there is one player who won playing only a 50 cent bet and won 4 million. It can and does happen, this is why free online slots is a great offer.