In Grow the Hole , rebirth usually means resetting your progress in exchange for a permanent boost or a new upgrade path. Based on the current public info I found, the game’s update page highlights that rebirth unlocks new black holes at Rebirth , so the feature seems tied to progressing far enough in the run and then claiming a stronger version of your hole.

How rebirth works

  • Play normally until you reach the game’s rebirth requirement.
  • Open the rebirth option in the game’s UI when it becomes available.
  • Confirm the rebirth to reset your current progress and gain the reward.
  • Use the new bonuses to grow faster on the next run.

What the update suggests

The update listing specifically mentions “New BLACKHOLES at Rebirth,” which strongly suggests rebirth is not just a reset, but also a way to unlock stronger hole types or new mechanics. That means the best strategy is usually to push as far as you can before rebirthing, so the reward is worth the reset.

Practical tips

  • Focus on clearing the most valuable objects first.
  • Save rebirth for when progress slows down hard.
  • After rebirth, invest the boost into faster early growth so your next run snowballs sooner.

Quick note

I couldn’t verify a more detailed, game-specific rebirth guide from reliable public sources in the time available, so I’m keeping this to the clearest confirmed part: rebirth unlocks new black holes in Grow the Hole.

TL;DR: Rebirth in Grow the Hole is the reset-and-reward mechanic, and the latest public update points to it unlocking new black holes or stronger forms at rebirth.