To achieve 100% completion, you'll need to find every collectible. Here are some tips:
- Beep-0's Scan: Regularly use Beep-0's scan ability (press 'Y' on the overworld) to highlight hidden objects, interactive elements, and uncollected items in your vicinity. This is invaluable for finding hidden chests and Planet Coins.
- Revisit Planets: Many areas are initially inaccessible. After acquiring new Sparks or unlocking new hero abilities, revisit previous planets. New paths will open up, leading to previously unreachable collectibles and secret zones.
- Talk to NPCs: Many NPCs offer hints about nearby secrets or initiate side quests that reward collectibles. Always engage in dialogue with everyone you meet.
- Environmental Clues: Look for subtle environmental clues like cracked walls (destructible), suspicious-looking bushes (hidden paths), or unusual rock formations.
- Map Markers: The in-game map will often show areas with uncollected items, but not their exact location. Use these markers as a general guide and then thoroughly explore the indicated area.
- Puzzle Solutions: Some collectibles are locked behind environmental puzzles. Don't give up on a puzzle; often, the solution is simpler than it appears or requires a specific Spark ability.
Patience and thorough exploration are your best friends when it comes to collecting everything the game has to offer.