Trailing wilds remain on the playfield for the next spin. Slot machines can have a couple of different types of bonuses. Most casinos offer a no download version of their games that runs through your web browser without any permanentdownload, and bonuses are still applicable when you play this way. Learn everything you need to know about slot bonuses with this simple infographic: To learn more about slot bonuses, keep reading. Still, no deposit bonuses are more favorable to slot players than they are with other games. Many have a progressive jackpot, which grows over time (as other players make wagers) and is hit by getting a certain combination of symbols. Both the versions here at GSM are the ". Most slot machine manufacturers don't reveal whether or not their bonuses are predetermined.