Showing the Odds of Random Rewards
When a game sells a chance at an item, the player deserves to know the chance. Publishing odds well is a design skill, not just a legal box.
Loot boxes and the law
A loot box is a virtual item that grants a random selection of rewards, often sorted into rarity grades where each grade is less likely than the last. Several countries, including China and South Korea, require games that sell them to publish the odds, and regulators elsewhere have looked at whether some designs amount to gambling.
Odds alone are not enough
A list of percentages is accurate but hard to feel. Players understand odds better when they also see what to expect over many tries, the idea behind expected value: the long-run average result if the same choice were repeated many times.
Learning from simple number games
Public lotteries are a useful model, because their probabilities follow directly from counting combinations and their rules are published in full. A worked example in Traditional Chinese is this explainer for Taiwan's 3 Star number game that derives each prize tier's chance and the return to players step by step (3星彩怎麼玩). It states plainly that the game returns less than players put in on average, which is exactly the kind of honest summary a drop-rate screen should aim for.
A checklist for an odds screen
- One tap from the purchase button, not buried in settings.
- Every item or grade listed, with its chance per open.
- Any guarantees or pity rules stated in plain words.
- The real-money price shown next to the in-game price.
If a designer would be uncomfortable showing the odds, that discomfort is useful information about the design.
Saved 2026-10-22