Embodiments of the disclosed technology comprise advancements to electronic gaming machines. In particular embodiments, when a bonus feature is activated and, as part of the bonus feature, a sub-feature is selected from among multiple available sub-features. The bonus feature can include one or more sub-features that trigger a further secondary RNG selection. For example, the one or more sub-features can include one or more of (a) a credit awarding secondary feature in which a secondary RNG is applied to select the amount of credits; (b) a free-spin secondary feature in which one or more free games can be awarded; and/or (c) a reel-spin feature in which an enhanced reward scheme is applied. In further embodiments, the reel-spin feature can further include a random selection of a threshold that ensures the player the threshold amount until it is exceeded by the game mechanics.