Streak · 7 days+185 XP
7-Day Sunset Time Log
Note the time the sun sets each evening for a week and see how it shifts. Check in once a day.
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Science · Facts & stats · iChallenge network
The 2 Day Challenge
Daily facts and stats about days and how we measure them, plus real challenges to put them to work.
Warm-up questionNot ranked · tap an answer
A day on Mars is called a 'sol'. About how long is it?
A Martian solar day lasts about 24 hours 39 minutes, only a little longer than an Earth day.
Level1Rookie
XPPlay a round to earn XP
Streak0days
LeagueBronzeweekly
Daily #11Resets 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
Map Your 48 Hours
Log how you spend two full days in one-hour blocks and post a short breakdown of where the time went.
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Streak · 14 days+220 XP
14-Day Same Wake Time Streak
Get up at the same time every day for two weeks, weekends included. Check in each morning.
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By the numbers
Live counts from 2DayChallenge.com. All arena stats →
Facts in the pack12
Visitors, 30 days54
Challenge joins12
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 2DayChallenge.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.