Streak · 7 days+185 XP
7-Day Concrete Spotting Streak
Spot one concrete structure each day, like a bridge, curb or wall, and note what it is used for. Check in daily.
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Home · Facts & stats · iChallenge network
The Concrete Challenge
Daily facts and stats about concrete, plus real challenges to put them to work.
Warm-up questionNot ranked · tap an answer
Portland cement was named for its resemblance to what?
Its inventor thought the set cement looked like Portland stone, a limestone quarried on the Isle of Portland.
Level1Rookie
XPPlay a round to earn XP
Streak0days
LeagueBronzeweekly
Daily #8Resets 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
Find the Expansion Joints
Look at a sidewalk or driveway, find its control or expansion joints and post a short write-up on why they are there.
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Proof+250 XP
Sidewalk Chalk Art
Draw a chalk picture on a concrete path or driveway, with permission, and post a photo link or short write-up.
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Streak · 10 days+200 XP
10-Day Building Word Streak
Learn one construction term a day, like aggregate or curing, and explain it in a sentence. Check in daily.
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By the numbers
Live counts from ConcreteChallenge.com. All arena stats →
Facts in the pack12
Visitors, 30 days25
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 ConcreteChallenge.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
Do pros compete too?
Yes — pros and homeowners rank on separate boards when flagged.
Can I get matched to a pro?
Home-trade challenges link into the network's verified pro directory.
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.
