Streak · 7 days+185 XP
7-Day Lab Notebook Streak
Each day observe something, like a plant or the weather, and record the date, what you saw and one question. Check in daily.
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Science · Facts & stats · iChallenge network
The Challenge Lab
Daily facts and stats about science labs and experiments, plus real challenges to put them to work.
Today's 3 challenges
In the scientific method, what is a testable prediction called?
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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
Red Cabbage pH Test
With an adult's help, make red cabbage juice indicator and test vinegar and baking soda water. Post a photo link or short write-up.
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Proof+250 XP
Run a Fair Test
Pick a simple safe question, like which paper towel soaks up the most water, test it fairly and post a short write-up of your results.
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By the numbers
Live counts from ChallengeLab.com. All arena stats →
Facts in the pack12
Visitors, 30 days44
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 ChallengeLab.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
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Questions
How hard are the quizzes?
They ramp — early rounds are approachable, streaks unlock harder sets.
Can I suggest questions?
Yes, via the contact form; credited if used.
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.