That’s 8 different currency types, the way I count it. Hades has obol, darkness, gems, chthonic keys, ambrosia, titan’s blood, diamonds, and nectar. Take a look at games like Hades or Control. You can also have certain currency types tied to key parts of the game’s progression. If you make multiple currency types, which are difficult / inefficient to exchange for each other, it encourages people to interact with more portions of the game. If you have one currency type, you can come up with a dominant strategy that maximizes production of that particular currency type. In a sense, games are often about managing resources. Multiple currency types are a key part of freemium / microtransaction games, but there are other reasons to have multiple currency types, and it’s becoming more and more common across all types of games.
