Streak · 7 days+185 XP
7-Day Puzzle Streak
Solve one logic puzzle, riddle or math problem each day and note how you cracked it. Check in once a day.
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Education · Facts & stats · iChallenge network
The Problem Challenge
Daily facts and stats about problem solving and famous problems, plus real challenges to put them to work.
Warm-up questionNot ranked · tap an answer
What is 'rubber duck debugging'?
Talking through code line by line, even to a rubber duck, often helps programmers spot their own mistakes.
Level1Rookie
XPPlay a round to earn XP
Streak0days
LeagueBronzeweekly
Daily #2Resets 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
Solve It in Four Steps
Pick a real everyday problem, work through understand, plan, act and review, and post a short write-up.
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Streak · 10 days+200 XP
10-Day Rubber Duck Log
Each day, explain one tricky thing you're stuck on out loud, step by step, then note what you figured out. Check in daily.
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By the numbers
Live counts from ProblemChallenge.com. All arena stats →
Facts in the pack12
Visitors, 30 days59
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 ProblemChallenge.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 judges creative challenges?
Completion is self-logged; community votes rank showcase entries.
Can agencies compete as teams?
Yes — one handle per team 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.