Read the rule before answering
Use the current eight-planet classification of our solar system. Dwarf planets, moons and planets around other stars are outside this set.
Six untimed questions, starting with this one.
Check an answer here
Check this question’s accepted set without submitting to a game or opening the full answer list.
Only your submitted spelling will be checked. Other answers stay hidden.
Read the lesson — reveals answers & strategy
Understand the boundary
The rule uses the eight planets of our solar system. It excludes dwarf planets, natural satellites and planets orbiting other stars. This is a named classification, not a question about every object that goes around the Sun.
Verify the facts: NASA · Our solar system ↗
Choose an answer for your goal
Neptune has the highest fixed score in this set, at 92, while Uranus earns 87. Neither number predicts what another player will type. In a solo dive a popular answer still earns its full fixed score. In Battle, another player choosing the same canonical answer cancels it, so reviewing several eligible planets is more useful than memorizing only the top scorer.
Worked examples — reveals answers
- Terra · Accepted
- An explicit alias for Earth in our validator; it receives Earth’s 15 points.
- Neptune · Accepted
- One of the eight planets, worth 92 fixed practice points.
- Europa · Outside this set
- A moon of Jupiter, so it belongs in a different question.
Practice the distinction
Recall the planets outward from the Sun, then choose a second answer without reopening the list. Use the rocky and outer-planet questions to test whether you can apply an extra restriction to the same list.
Try it in the checker ↑Give me a hint — no answer revealed
Start with the full category, then apply the exact boundary: The eight planets. Dwarf planets are not included. You only need one qualifying answer. A longer name is not automatically rarer.
Reveal a verified practice pick
This pick belongs to the selected question’s answer set. Points are a fixed knowledge rating.
Reveal a fast high-scoring answer
Shortest accepted input at 65+ points
UranusUranus · 87 points · 6 characters
Uranus is planet 7 from the Sun. Dwarf planets are a separate classification.
Highest fixed score
Neptune92 points · Shortest accepted spelling: Neptune
These are editorial points, separate from real player choice counts.
Reveal all 8 practice answers
Filter by a name or listed alias. Scores are fixed knowledge ratings.
8 accepted answers
No answers match these filters. Try another spelling or a lower minimum score.
What players actually choose
– UTC · 375 recorded daily rounds. Source: Krillionio daily submissions. Skips and timeouts are included in the denominator; practice and Battle are excluded.
355 / 375 rounds ended with an accepted answer (94.7%). Average: 67.2 fixed points.
Compare observed choices — reveals answers
Question quality signals
These measurements cover completed daily rounds recorded with timing and rejection details. Older rounds without those fields are excluded. At least 20 measured rounds are required per question.
This question has fewer than 20 measured rounds.
Review thresholds: below 20% accepted, at least 40% timed out, or at least 30% of rounds with an unlisted input. These flags suggest checking the wording and answer coverage; they do not prove an answer is wrong or change points automatically. Abandoned rounds and practice attempts are not included.
How these statistics work
- What is counted
- Source: Krillionio daily submissions. Skips and timeouts count as rounds; practice and Battle are excluded.
- When comparisons appear
- A question needs at least 20 recorded rounds. An answer also needs at least 5 recorded choices within that question.
- What the data can tell you
- These anonymous browser records are not verified unique people or a representative survey. The player rarity index does not change game points or predict the original Krillion game. Raw submissions stay private.
Rule examples & common mix-ups — may reveal answers
- The eight planets and dwarf planets are separate sets. A moon belongs to neither planet set; apply any size, position or name-length condition as well.
These notes explain the question boundary; they are not a ranking of player mistakes.
Why these answers qualify
Each entry belongs to the bounded set defined by the prompt. The named source supports the underlying facts; our editorial scoring is a separate layer.
Source: NASA · Our solar system ↗
Reference version: 2026-09-13. See our answer policy for how we handle aliases and omissions.