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Free IQ tests, speed math games, brain training tools and expert tips — all in one place.

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🎮 Brain Games
Challenge yourself with our scientifically designed brain games
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IQ Test
30 questions across 6 cognitive domains. Get your IQ score with detailed analysis.
Pattern RecognitionLogicSpatial
⚡
MathBlitz
60 questions, 6 levels, 3 lives. Solve math problems against the clock!
Speed60 Questions6 Levels
🎯
Memory Matrix
Remember patterns and sequences. Train your working memory and boost concentration.
MemoryFocusPatterns
⚡ Mental Math Tricks
Learn these tricks to calculate faster than a calculator
01
Multiply by 11
Add the two digits and place the result in the middle.
35 × 11 = 385
47 × 11 = 517
02
Square Numbers Ending in 5
Multiply first digit by itself+1, append 25.
35² = 3×4 = 12 → 1225
75² = 7×8 = 56 → 5625
03
Multiply by 9
Multiply by 10 and subtract the original number.
7×9 = 70-7 = 63
23×9 = 230-23 = 207
04
Fast Percentage
X% of Y = Y% of X. Pick whichever is easier!
8% of 25 = 25% of 8 = 2
4% of 75 = 75% of 4 = 3
05
Multiply by 5
Divide by 2 then multiply by 10.
68×5 = 34×10 = 340
37×5 = 18.5×10 = 185
06
Add Large Numbers
Round up to nearest 10, add, then subtract.
567+298 = 567+300-2 = 865
📚 Brain Training Blog
Expert articles on intelligence, math and cognitive science
🧠
INTELLIGENCE
What Is IQ and How Is It Measured?
IQ is a score from standardized tests designed to assess human intelligence. Learn what it really means...
📅 June 2025 · ⏱ 5 min read

Read More →
⚡
MATH SKILLS
10 Mental Math Tricks That Will Blow Your Mind
These simple techniques help you calculate faster than most calculators...
📅 June 2025 · ⏱ 7 min read

Read More →
🎯
BRAIN TRAINING
How to Improve Your Memory in 30 Days
Scientific research shows targeted brain training can significantly improve working memory...
📅 May 2025 · ⏱ 6 min read

Read More →
📊
SCIENCE
The Science Behind Brain Neuroplasticity
Your brain can physically change and grow throughout your life. Here's how...
📅 May 2025 · ⏱ 8 min read

Read More →
🏆
TIPS
5 Daily Habits of People with High IQ
Studies of highly intelligent people reveal common daily habits that keep minds sharp...
📅 April 2025 · ⏱ 4 min read

Read More →
🔢
MATH
Why Math Makes Your Brain Stronger
Practicing mathematics physically strengthens neural connections and improves cognitive function...
📅 April 2025 · ⏱ 5 min read

Read More →
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👋 About Rhombiq
Our mission is to make brain training free and fun for everyone

Rhombiq was created with one simple goal: make high-quality brain training accessible to everyone, completely free. We believe intelligence can be improved with the right tools.

Our tests and games are designed based on established cognitive science research. Whether you want to measure your IQ, improve mental math, or keep your brain sharp — Rhombiq has the right tools for you.

Join millions of users worldwide who train their brains with Rhombiq every day.

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Always Free

All brain games and tests are completely free forever

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Science-Based

Built on cognitive science and established IQ research

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Global Community

Users from 150+ countries train their brains with us

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Privacy First

We never sell your data. Your results are yours only

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Mobile Friendly

Works perfectly on any device, anywhere, anytime

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Accurate Results

IQ algorithm calibrated against standard test norms

Privacy Policy

Last updated: June 1, 2025

1. Information We Collect

Rhombiq collects minimal information. We may collect anonymous usage data, test scores stored locally on your device, and email addresses if you subscribe to our newsletter.

2. How We Use Information

We use information to improve our games, analyze site performance, and send newsletters. We do not sell or share your personal information with third parties.

3. Cookies

We use cookies to save game progress locally. Google Analytics and Google AdSense may set their own cookies. You can disable cookies in your browser settings.

4. Google AdSense

We use Google AdSense to display ads. Google may use cookies based on your visits. You can opt out at google.com/settings/ads.

5. Children's Privacy

Rhombiq is designed for users aged 13 and above. We do not knowingly collect data from children under 13.

6. Contact Us

Questions? Email us: privacy@rhombiq.com