Streak · 7 days+185 XP
7-Day Graph Sketch Streak
Each day draw a graph of something real, like friends, bus stops or web links, as dots and lines. Check in once a day.
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Coding · Facts & stats · iChallenge network
The Graph Challenge
Daily facts and stats about graphs in graph theory, plus real challenges to put them to work.
Warm-up questionNot ranked · tap an answer
What makes a graph 'weighted'?
Weights often stand for distances, travel times or costs, as on a road map.
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
Solve the Bridges
Draw the Seven Bridges of Königsberg and try to cross each bridge once. Post a write-up explaining why it cannot be done.
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Proof+250 XP
Code a Search
Write a breadth-first search in any language or pseudocode and post a link or short write-up of how it works.
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Streak · 14 days+220 XP
14-Day Algorithm Streak
Trace one graph algorithm step by step on paper each day for two weeks. Check in daily.
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By the numbers
Live counts from GraphChallenge.com. All arena stats →
Facts in the pack12
Visitors, 30 days36
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 GraphChallenge.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
What languages count?
Any language. Challenges score consistency and completion, not syntax.
Is this for beginners?
Yes — quiz rounds start easy and scale with your streak.
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.
