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    Modelling a Gacha Box

    Modelling a Gacha Box

    This example is based on the mechanic of awarding winning players with Hextech Key Fragments and Hextech Chests, in Riot’s League of Legends.

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    Remember to hit the PLAY button on the embedded diagrams throughout this article.

    Distribution of items based on designed drop rates.

    The player Opens 1 Hextech Chest. The player gets Rewards based on each item’s drop rates.

    • △ Sources produce Resources
      • The Source Opens Hextech Chest produces 1 opened chest each time it’s triggered
    • → Resource Connections transfer Resources
      • The amount of chests opened is set by the number 1 on the “get” Resource Connection
    • ◇ Gates distribute Resources
      • The dice symbol on the “Rewards” Gate denotes that the distribution is random
      • The chances for each type of drop are shown on the Formulas of the connections leaving the Gate
    • ◯ Pools collect Resources
      • Are used to keep track of the player’s items

    The following example sets the conditions needed for the player to reach the “open Chest” objective.

    The player wins a match. For each match won the player has the opportunity to get a Key Fragment, with a chance of 40%. If the conditions are met, a Key Fragment is awarded.

    Every time there are 3 Key Fragments available, the player forges 1 Key.

    • Converters transform one type of Resource into another
      • ▷ Forge transforms 3 Key Fragments into 1 Key
      • Note that the forge action happens AS SOON AS ALL Resources needed are available

    The player wins a match. For each match won the player gets a grade. If the grade is higher than -S (chance of that is 50%). If the condition is met, there’s a chance of 40% they receive a Chest.

    We’ll now tie these systems together.

    The △Open Hextech Chest becomes a▷Converter that uses 1 Key and 1 Chest to get Rewards.

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