Proof+250 XP
Balloon Rocket Build
Make a balloon rocket with string, a straw and tape, and measure how far it travels. Post a photo link or short write-up.
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Science · Facts & stats · iChallenge network
The Launch Challenge
Daily facts and stats about rocket launches and space exploration, plus real challenges to put them to work.
Today's 3 challenges
What is Earth's approximate escape velocity?
You went
Level1Rookie
XPPlay a round to earn XP
Streak0days
LeagueBronzeweekly
Daily #27Resets 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.
Streak · 7 days+185 XP
7-Day Night Sky Streak
Step outside each evening and look for the Moon, a planet or a passing satellite. Check in once a day.
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Proof+250 XP
Launch History Timeline
Build a simple timeline of ten key moments in spaceflight history and post a photo link or write-up.
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By the numbers
Live counts from LaunchChallenge.com. All arena stats →
Facts in the pack12
Visitors, 30 days64
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 LaunchChallenge.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
Who is this for?
Founders, operators and students proving execution speed in public.
What do winners get?
Rank, badges and league promotions. Some challenges carry a sponsor-funded prize, stated on the card.
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.