100% Completion Guide
100% today means all 120 stars (109 at launch + 11 from the Mysterious Update), every elemental gem, 18 obsidian, 30 pyramidions and 5 meteorites. Nothing is missable — you can always come back.
100% in Isles of Sea and Sky means: every star, every gem, every secret — and since July 2025, the Mysterious Update's collectibles on top. Nothing is permanently missable; you can keep playing after the credits.
What 100% covers
| Category | Target |
|---|---|
| Stars | 120 (109 at launch + 11 from the Mysterious Update) |
| Elemental gems | 12 of each of the four colours |
| Obsidian (black gems) | 18 in the current version (more than launch — the update added more) |
| Runes | 6 |
| Pyramidions | 30 (guide) |
| Meteorites | 5 |
| Prize | Extra ending themes from the developer |
Route to 100%
- Finish the story first. Reach the Sanctum and roll the ending (walkthrough) — mutable collectible layers are much easier with full movement.
- Lock in movement: all four upgrades and all six runes (upgrades and runes).
- Sweep the islands for stars and gems. Remember the map counts for you; the table below is where the awkward ones live.
- Clean up the update layer: the circlet, the wall writing, pyramidions and meteorites (pyramidions, Mysterious Update).
Where the awkward collectibles hide
From the community's collection notes (numbers for the main islands are on the in-game map):
| Island | Notes |
|---|---|
| Starting island | 3 stars — one sits behind the Sanctum's gate |
| Stoney Cliffs | Seal quiz at A2, instrument quiz at D1; 10 earth gems; a star underground needs Flippers; some underground walls can be broken |
| Tidal Reef | Instrument quiz at D1; 10 water gems; one star needs Wings, one hides behind a waterfall; the changing water level opens paths |
| Raging Volcano | Statue quiz at D4, instrument quiz at B3; 10 fire gems; two stars need a bridge built from the neighbouring room; exploding crates ignite each other |
| Frozen Spire | Instrument quiz at D4; 10 wind gems; one star means gliding over a hole to a secret staircase; dropping a wooden crate from high up destroys it |
| Snake island | 10 stars; the top room is sealed by the four elemental runes (opening it wants 9 obsidian) |
| The four elemental mini-islands | 3 stars each (one from knocking the giant bell); each has a bell locked by the Grass rune |
| Grass Rune island | 1 star, no requirements |
| Red Mountain island | Knock all four giant bells to open the gate — this unlocks the giant bird travel |
| Bird-only island | 1 star and an obsidian behind a secret passage |
| South-pole grass island | 7 stars and 4 gems — expects all four upgrades |
| Tiny water island below Frozen Spire | 1 star; copy the crate arrangement from Stoney Cliffs room B3 (the mark between the rocks matches) |
The fine print
- Stars were recalculated in community records: snake island's total was corrected from 11 to 10 at launch, and the Mysterious Update added 11 more (including 8 from paired-elemental rooms, one below the snake island landing, one in Tidal Reef's hidden shells, one below the Frozen Spire birds). The current ceiling is 120.
- A community footnote on keys: after full completion, players have reported roughly 13 keys left unaccounted for — nobody has confirmed which final key/door pair is the odd one. If you are one key short of "everything", you are not alone.
- Instrument quizzes (the note-based rooms) appear on Stoney Cliffs, Tidal Reef, Raging Volcano and Frozen Spire.
- The sleep-spot meta and the spiral teleport network are part of the update-era 100%.
FAQ
Do achievements require 100%? Almost — all except Power Napper, and even that only wants an idle hour (achievements). But 100% in the artsy sense (all stars and gems) is a self-set challenge with extra ending themes as the reward.
Can I get everything after the ending? Yes. The game continues from the Sanctum after the credits, and every collectible remains accessible. Nothing is timed, nothing is one-shot.
Is anything randomised against me? Meta puzzles and some routes are randomised per save (that is deliberate), but totals, gates and rewards are fixed. Randomisation changes how, never whether.
