Free · no sign-up · no ads · nothing to install
Pick a room. Come out cleverer.
CurioZoo is a place to spend an hour thinking instead of scrolling. Real mathematics, games that are really puzzles, and practice for the tests schools use. Everything explains itself afterwards.
The rooms
More are being built.
Your practice so far
GiftedPrep
The kinds of puzzles used on the CogAT, NNAT and OLSAT — so test day is not the first time your child sees one.
Who is practicing today?
This is a familiarization tool only. It is not affiliated with, endorsed by, or derived from Riverside Insights (CogAT), Pearson (NNAT, OLSAT), PAR (RIAS-2), or any school district. No real test items are reproduced here.
Pick a puzzle type
All 31 kinds of puzzle in one list. Practice just one of them.
Choose a test
CogAT, NNAT or OLSAT — then pick one question type.
Parent guide: what the scores mean, and the week before
Which test?
Not sure which one your district uses? That is normal — most districts do not announce it. Mix it up covers all three.
Pick a puzzle type
Practice question
Question 1 of 12
For parents
Math Lab
Advanced maths, one grade at a time. Short lessons, then puzzles.
Topic
Your turn
Fun and games
Games for remembering things. No scores are kept anywhere but on this device.
← Back to games
Look through the flags →
Name the Flag
Every flag in the world. Look through them first, then see how many you can name.
Learn
See them first
Look through all 250 flags, one at a time, with the country underneath. No score, nothing to get wrong.
Practice
Name the flag
← Back to games
Open the periodic table →
Name the Element
Everything is made of these. Open the table and read how it works, then test yourself four different ways.
Learn
See them first
See the whole periodic table, tap any element, and read how it was worked out. No score, nothing to get wrong.
Practice
Name the element
← Back to games
Open the angle workshop →
Guess the Angle
How far does it open? Learn the tricks first — a clock face beats a protractor — then test yourself six different ways.
Learn
See how angles work
Turn an angle and watch the number change, meet the clock trick, and find out why long arms fool almost everybody. No score, nothing to get wrong.
Practice
Guess the angle
← Back to games
Look through the capitals →
Name the Capital
The country is given, the capital is the answer. Look through them first, then see how many you can name.
Learn
See them first
Look through all 192 countries, one at a time, with the capital underneath. No score, nothing to get wrong.
Practice
Name the capital city
← Back to games
Look through the outlines →
Name the Country Shape
Every country by its outline. Look through them first, then see how many you can name.
Learn
See them first
Look through all 242 outlines, one at a time, with the country underneath. No score, nothing to get wrong.
Practice