Streak · 7 days+185 XP
7-Day Big Number Streak
Each day, estimate one big number (like seconds you've been alive), then work it out and compare. Check in once a day.
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Challenge · Facts & stats · iChallenge network
The Billionaire Challenge
Daily facts and stats about billions and very large numbers, plus real challenges to put them to work.
Today's 3 challenges
In the traditional long scale, still used in many European languages, what does 'billion' mean?
You went
Level1Rookie
XPPlay a round to earn XP
Streak0days
LeagueBronzeweekly
Daily #32Resets 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
Picture a Billion
Make a drawing, chart or short explanation that shows how big one billion really is, and post a link or write-up.
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Streak · 14 days+220 XP
14-Day Estimation Practice
Guess one everyday quantity each day, such as steps walked or words read, then measure it. Check in daily.
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By the numbers
Live counts from BillionaireChallenge.com. All arena stats →
Facts in the pack12
Visitors, 30 days32
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 BillionaireChallenge.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
Is this financial advice?
No. These are educational games and habit challenges, not advice.
How do I win?
Play the daily round and finish challenges. Leaderboards rank XP for today, this week and all time.
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.