As in normal gacha, the rewards from box gacha come from a randomized loot table, but with one big design change. The box contents are finite and each reward can only be pulled once. If there are 20 items on the loot table, they will all be distributed within exactly 20 pulls, and even if one item has a tiny 0.1% chance of dropping, you can be certain that, in the worst case scenario, you’ll only need to pull the other 19 items before receiving your grand reward.
The mechanics of box gacha bring a great level of comfort to the players, and make it the perfect solution for parts of the economy that have a fixed number of duplicates, or wherever a duplicate would be deemed inappropriate. For example, imagine that your players have ...