iChallenge.comAn eCorp Venture 1 Guest0

1,757 arenas · one profile · one impact ledger

Play a round. Finish a mission. Count what changed.

iChallenge is a network of 1,757 free challenge arenas, from code to climate to fitness. Five questions a day, a streak that follows you everywhere, and missions whose results are counted on a public ledger, with the math shown.

Arenas live, 14 days1,403
Players7,180
Mission actions logged2
kg CO₂e avoided0.4
Today's 3 challenges

How many colored stickers are on a standard 3x3x3 puzzle cube?

Confident man posing in studio holding a shiny trophy, showing pride in accomplishment.
Photo: RDNE Stock project / Pexels
Daily #34Resets at midnight UTC

Today's round

  • 5 questions
  • 20s each
  • 0 played today

One ranked attempt per day. Practice as much as you like.

Climate, ocean & nature arenas

The flagship cluster. Every mission here logs a real number, from kg CO₂e to litres of water to trees, counted toward SavingTheWorld.org. Network ledger →

LiveClimateChallenge.comClimate action, scored like a gameMissions →LiveEarthChallenge.comKnow your planet. Then do something for it.Missions →LiveOpenWaterChallenge.comKnow the water. Respect the water.Missions →LiveNatureChallenge.comGet outside. Log what lives there.Missions →LiveGreenChallenge.comSmall green habits, kept for realMissions →LiveCarbonChallenge.comCount your carbon. Then cut it.Missions →LiveRecycleChallenge.comRecycle right. Every item counted.Missions →LiveSolarChallenge.comLearn solar. Price your roof.Missions →LiveEcologyChallenge.comStudy the web of life. Then strengthen one strand.Missions →

Arenas to play now

Every arena has its own daily round and leaderboard. Your level and streak count on all of them.

Coding NLPChallenge.com 15 playing this week Play → Geography BostonChallenge.com 8 playing this week Play → Coding CodeChallenge.com 8 playing this week Play → Home & Property BrickChallenge.com 5 playing this week Play → Home & Property CabinetChallenge.com 5 playing this week Play → Finance HedgeChallenge.com 5 playing this week Play → Challenge WriteChallenge.com 5 playing this week Play → Finance InvestmentChallenge.com 4 playing this week Play →

The tools behind the missions

Alerts become missions, missions become numbers, numbers become impact. These are the working products that make that loop real.

Impact homeSavingTheWorld.org

Every venture in this network sets aside 2% for the planet and for keeping AI safe. Planet-track missions on every arena roll up here.

Working now · FloridaEcoBoard.com

Free alerts for every Florida county when sewage is spilled, algae toxins are detected, lake discharges surge or the Weather Service issues a warning.

Alerts, every marketAlertStream.com

One alert stream per state and county: weather, flood, heat, fire, air and quakes from NWS, USGS and Open-Meteo, each with a mission you can finish on the arena for your state.

Daily briefingClimateNews.com

The climate newsroom of the network: what moved today, with sources, so the daily round has something real to ask about.

The directory

1,757 challenge and contest arenas, 1,403 live in the last two weeks, 1,509 with a hand-written pack. Each one is its own venture with an agent card other software can read.

Live nowClimate & greenCities & statesCodeFitnessAll 1,757 →

Browse by topic

Challenge542 arenasGeography154 arenasCoding103 arenasAI96 arenasHome & Property86 arenasEducation76 arenasSports66 arenasArt & Creative66 arenasStartup62 arenasHealth41 arenasMarketing40 arenasCooking & Food40 arenasTrivia38 arenasFinance37 arenasCrypto37 arenasClimate & Green32 arenasNature & Outdoors25 arenasProductivity24 arenasFamily22 arenasFitness22 arenasCivics18 arenasDrinks17 arenasImpact16 arenasOcean & Marine16 arenasMusic15 arenasScience12 arenasHistory12 arenasSpace8 arenas

Leaderboard

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How it works

  1. Play the daily roundFive questions, easy to hard, 20 seconds each. Speed and combos add points.
  2. Keep your streakPlay any arena each day. Every 7 days earns a freeze that covers a missed day.
  3. Finish a missionCheck in on a streak or post proof. Missions with an impact unit log a counted result on the ledger.
  4. Climb your leagueEach Monday the top 20% of your league move up. Sponsors fund prizes on the missions that matter.

Badges

Sixteen to collect across the network.

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.