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Sonic Generations boss keys and rivals: how to reach Time Eater

Solve boss-gate progression and identify the main boss and rival sequence.

Edition covered

The original 2011 console/PC Sonic Generations, illustrated with original PC storefront images. The 3DS game and Sonic X Shadow Generations remaster have different content and are excluded.

4 bosses · one picture per entry · open a picture for full size.

Boss keys and rivals

Time Eater in Sonic Generations
Boss

Time Eater

Role: Final boss. Preparation: Complete progression and gather all seven emeralds.

Reference

Quick notes

  • Collect three keys for each era boss. After restoring an era’s three stage gates, complete at least one challenge for each of its stages.
  • Defeat the rivals for emerald progress. Metal Sonic, Shadow and Silver are separate rival encounters.
  • Recognize the main boss sequence. Death Egg Robot, Perfect Chaos and Egg Dragoon test different styles before Time Eater.
  • Check every emerald before the finale. Time Eater requires the full Chaos Emerald set and the completed main progression.

Defeat the rivals for emerald progress

If a gate is still closed
Missing requirementWhere to lookAction
A stage is not restoredAct 1 and Act 2 gatesClear the unfinished act
One boss key is unavailableThat stage’s challenge gatesComplete one challenge there
A key is still floating in the hubNear the cleared challenge areaCollect it after fulfilling the condition
A Chaos Emerald is missingRival or main boss gatesFinish the outstanding encounter
Useful tip

Time Eater requires the full Chaos Emerald set and the completed main progression.

References
Guide references
ReferenceWebsite
Sonic Generations publisher/storefrontstore.steampowered.com
Original Generations route and unlock referencegamefaqs.gamespot.com
SEGA original-edition announcementsteamcommunity.com