Donkey Kong Bananza’s post-game starts after you roll the credits, and a guide specifically notes that the Ingot Isle Cave-In layer opens up at that point as a new area to explore. That means the “post game” is not a separate timed mode—it begins once the main story is cleared.

What opens up

  • The Ingot Isle Cave-In layer becomes available after credits.
  • Post-game content includes extra exploration and cleanup objectives, especially for players hunting remaining collectibles.

In plain terms

If you’re asking “when do I get post-game,” the answer is: immediately after finishing the main story and seeing the credits.

Extra context

Recent coverage from a Planet Core walkthrough also reflects that the game continues with new developments late into the story, which lines up with a structured endgame/post-game flow rather than a hard stop.