Streak · 7 days+185 XP
7-Day Night Sky Streak
Step outside each evening and spot one star, planet or constellation. Note what you saw and check in daily.
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Science · Facts & stats · iChallenge network
The Singularity Challenge
Daily facts and stats about singularities, black holes and infinity in math, plus real challenges to put them to work.
Warm-up questionNot ranked · tap an answer
The first image of a black hole's shadow, released in 2019, showed one in which galaxy?
The Event Horizon Telescope released an image of the black hole in galaxy M87 in 2019.
Level1Rookie
XPPlay a round to earn XP
Streak0days
LeagueBronzeweekly
Daily #5Resets at midnight UTC
Today's round
- 5 questions
- 20s each
- 0 played today
One ranked attempt per day. Practice as much as you like.
Challenges
Join one, log your days or post your proof. Finishing earns XP and the Finisher badge.
Proof+250 XP
Explain a Black Hole
Write a short, plain explanation of what an event horizon is, as if for a 10-year-old. Post it as a link or write-up.
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Proof+250 XP
Graph 1/x
Sketch the graph of y = 1/x by hand and mark where it breaks. Share a photo link or short write-up.
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By the numbers
Live counts from SingularityChallenge.com. All arena stats →
Facts in the pack12
Visitors, 30 days69
Leaderboard
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Badges
Earned on any arena, shown on your profile everywhere.
First RoundFinish your first daily round.
FlawlessAnswer every question in a round correctly.
LightningA perfect round in under 25 seconds.
On a RollPlay 3 days in a row.
Week WarriorPlay 7 days in a row.
UnbreakablePlay 30 days in a row.
ExplorerPlay daily rounds in 5 different arenas.
GlobetrotterPlay daily rounds in 25 different arenas.
PolymathPlay daily rounds in 5 different topics.
In the ArenaJoin your first challenge.
FinisherComplete a challenge.
RecruiterInvite a friend who finishes a round.
CaptainInvite 5 friends who finish a round.
PodiumFinish a day in an arena's top 3.
ChallengerReach level 10.
Profile SavedSave your progress with an email.
Save your progress
Add your email to keep your level, streak and badges if you switch devices, and carry them to every iChallenge arena. One email when you save; no spam.
Put a prize on a challenge
Fund a prize on SingularityChallenge.com and your brand sits on the challenge card, the leaderboard and every finisher's share. Prizes only appear once they're funded, so players can trust what they see.
- Pick the challenge and the prize
- We review entries before a funded prize is awarded
- You get finisher and engagement numbers after it closes
Current sponsors
Questions
Do practice challenges need recordings?
Optional — honor-system logging with bonus for clips.
What genres are covered?
Rounds rotate across genres tied to this site's theme.
How does the daily round work?
Everyone on this arena gets the same five questions each day, from easy to hard. You get one ranked attempt; practice rounds are unlimited.
How is my score calculated?
100 points per correct answer, up to 50 more for answering quickly, a combo multiplier for answers in a row, and 150 bonus points for a perfect round.
Is it free?
Yes. Playing, streaks, badges and leaderboards are free. Some challenges carry a sponsor-funded prize; the challenge card shows it when one is funded.