Introduced 1 mechanic
Crypt of the NecroDancer
Every move must land on the beat, so two genres solve each other's pacing problems.
Mechanics this game introduced
These are recorded as first appearing here. Each links to a full history of where the idea went next.
Mechanics it built on
Ideas Crypt of the NecroDancer inherited rather than invented — each traceable back through the ontology to a root.