Streak · 7 days+185 XP
7-Day Cipher Streak
Encode or decode one short message a day using a simple cipher like the Caesar shift. Check in once a day.
SponsorseCorp.comSavingTheWorld.orgVentureOS.com
Be the first to join
History · Facts & stats · iChallenge network
The Secret Challenge
Daily facts and stats about secret codes and ciphers, plus real challenges to put them to work.
Today's 3 challenges
A message written in lemon juice is usually revealed by what?
You went
Level1Rookie
XPPlay a round to earn XP
Streak0days
LeagueBronzeweekly
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.
Challenges
Join one, log your days or post your proof. Finishing earns XP and the Finisher badge.
Proof+250 XP
Make Invisible Ink
Write a message in lemon juice, let it dry, then reveal it with an adult's help using a warm lamp. Post a photo link or write-up.
SponsorseCorp.comSavingTheWorld.orgVentureOS.com
Be the first to join
Streak · 7 days+185 XP
Secret Kindness Streak
Do one anonymous kind act every day for a week, like leaving a thank-you note. Check in daily without naming anyone.
SponsorseCorp.comSavingTheWorld.orgVentureOS.com
Be the first to join
Proof+250 XP
Invent Your Own Code
Create a symbol or letter-shift code, send a coded note to a friend and post a short write-up of whether they cracked it.
SponsorseCorp.comSavingTheWorld.orgVentureOS.com
Be the first to join
By the numbers
Live counts from SecretChallenge.com. All arena stats →
Facts in the pack12
Visitors, 30 days35
Leaderboard
- Loading…
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 SecretChallenge.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
Can nonprofits partner?
Yes — use the contact form for sponsored impact challenges.
Is participation free?
Always.
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.
