Post
When the red bar stops being just survival and starts being a wallet.
Health-as-currency lets players spend life for items, doors, power, shortcuts, or information. It works because it converts abstract greed into immediate vulnerability.
Example
The Binding of Isaac uses devil deals and curse rooms, Revita sells upgrades for health, and many roguelikes let players trade safety for power at shrines or shops.
Why it matters
Health-as-currency matters because it makes risk visible in the cleanest possible way: every purchase brings death closer.
Related concepts