Science · Facts & stats · iChallenge network
Daily facts and stats about graphs, charts and data visualization, plus real challenges to put them to work.
In graph theory, what is a connection between two vertices called?
You went
One ranked attempt per day. Practice as much as you like.
Join one, log your days or post your proof. Finishing earns XP and the Finisher badge.
Track one number each day, like glasses of water or pages read, and add it to a hand-drawn or free-app line chart. Check in once a day.
SponsorseCorp.comSavingTheWorld.orgVentureOS.com
Find a confusing chart in public news or reports and redraw it more clearly on paper or with a free tool. Post a photo link or a short write-up.
SponsorseCorp.comSavingTheWorld.orgVentureOS.com
Make a bar chart of something at home, such as books per shelf or items in the fridge by type. Post a photo link.
SponsorseCorp.comSavingTheWorld.orgVentureOS.com
Live counts from ChallengeGraph.com. All arena stats →
Earned on any arena, shown on your profile everywhere.
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.
Fund a prize on ChallengeGraph.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.
Any language. Challenges score consistency and completion, not syntax.
Yes — quiz rounds start easy and scale with your streak.
Everyone on this arena gets the same five questions each day, from easy to hard. You get one ranked attempt; practice rounds are unlimited.
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.
Yes. Playing, streaks, badges and leaderboards are free. Some challenges carry a sponsor-funded prize; the challenge card shows it when one is funded.