Streak · 7 days+185 XP
7-Day Sunset Log Streak
Note the time the sun sets each day for a week and watch how it shifts. Check in once a day.
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Science · Facts & stats · iChallenge network
The 24/7 Challenge
Daily facts and stats about the 24-hour day and 7-day week, plus real challenges to put them to work.
Today's 3 challenges
About how long does Earth take to spin once relative to distant stars, a sidereal day?
You went
Level1Rookie
XPPlay a round to earn XP
Streak0days
LeagueBronzeweekly
Daily #33Resets 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
Build a Sundial
Make a simple sundial with a stick and stones, mark the hours through a sunny day and post a photo link or short write-up.
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Streak · 14 days+220 XP
14-Day Time Diary Streak
Write down how you spent your day in one-hour blocks, every day for two weeks. Check in once a day.
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By the numbers
Live counts from 247Challenge.com. All arena stats →
Facts in the pack12
Visitors, 30 days29
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 247Challenge.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
How are scores counted?
Every correct answer earns points, faster answers earn a speed bonus, and each challenge day you log adds XP.
Can teams play?
Yes — share your referral link and compare scores on the leaderboard.
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.