I'm working on a game where the majority of points are earned during normal gameplay but each round a player might receive a bonus. In its minimal implementation, this could basically be an area of the board players can move a token to indicate how many times they have received this bonus with how many points they have earned in doing so.

But I'd like to do a few things:

* Use this as an opportunity to add theme

* Allow for this bonus to introduce hidden bonus points because the points scored during normal gameplay are public

* Introduce another area to make a decision

* Make it so that there can be potential snowballing scoring when players get this bonus several times

What I'm looking for is ideas or examples of other games that contain this type of mechanic.

For example, in Loch Ness, there is a deck of cards that has head/body/tail sets of cards and you can draw 1 of 3 revealed cards or a random card from the face-down draw pile. A full set of all 3 cards is worth 10 points, 2 is worth 5, and 1 is worth 1. This ties the theme into the bonus, makes the extra points somewhat hidden, especially since it's done through set collection, has a minor decision to make when taking the first 2 cards in a set, and can possibly add a large number of points which is more likely the more you get this bonus.

Thanks, having the distinct decks of cards is the direction I've been leaning. I like the thought of the first card drawn from the first deck to be almost totally at random but reveal two or more paths to snowballing that card into more points. Other decks might be split into different types of cards, each of which might contain the next card that player is looking for.

Another thought I had was that there could be a single deck and each time you got the bonus you get to take a card, but each time you get a bonus, you get to draw an additional card before picking one, placing the unpicked cards on the bottom of the deck. You'd still be doing something like looking for sets/combos but you'd know some of what you didn't pick and your odds of getting what you want goes up each time you get the bonus.