In-game or "In game" [closed]
Yes, in this sentence you would need a hyphen for in-game.
This is an example of a compound adjective. Here's the explanation from Grammar Book:
Rule 1. Generally, hyphenate two or more words when they come before a noun they modify and act as a single idea.
Examples: an off-campus apartment, state-of-the-art design
In-game modifies currency, and therefore you should use a hyphen.