The slot machine has a unique bonus feature that makes the standard gaming a bit more complex. You must gather all five letters of the word bonus on the screen to receive between 5 and 15 free spins. The intended symbols will, however, always display on the grid in the right sequence. For example, the letter N can only land on the third reel, while the letter B can only land on the first reel.
The scatter turns wild during the bonus round, which means every letter in the word BONUS can raise the value of any set of prizes. If you find more B-O-N-U-S symbols on the grid, the amount of free spins will increase.