Survive the Dead Tide Rising

[Fiery Grace]

Upon each opening, the probability of obtaining a Rare Prize increases. If a Rare Prize is obtained, the probability resets. A maximum of 15 openings guarantees a Rare Prize. 

If certain items are not included in the prize pool or have reached their maximum obtaining limit, their probability will be distributed proportionally to other items. 

The "probability" mentioned here is based on statistical results from a large sample size (many players) and may differ from the small set of testing data from individual players.

[Premium Collection]

Upon each opening, the probability for obtaining Rare Prize will be increased. Obtaining Rare Prize will reset the probability. 8 times is the maximum, which will guarantee Rare Prize. 
When certain items have not been included in the prize pool or hit the maximum times of obtaining, their probability will be distributed proportionally to other items.
"Probability" mentioned here are statistical results from a large sample size(a lot of players) and could produce differences with the small set of testing data from certain individual player.