background

Global Optical Illusions Knowledge Test

Since 2013, we have been measuring the global knowledge about optical illusions through the online quiz game.
The results are based on 525010 answers to questions in category optical illusions, given by players from 142 countries.
This test has questions in the following languages: Italian language, German language, English language, Polish language, Russian language, Ukrainian language and Polish language.

Results by country

Results by gender

men
 40.7% /157796
women
 23.6% /140176

Origin of answers

Answers distribution by gender:

gender
men
52%
157796
women
48%
140176

Answers distribution by language:

language
Italian language
0%
258
German language
0%
4630
English language
5%
28165
Polish language
56%
296855
Russian language
0%
3000
Ukrainian language
0%
989
Polish language
36%
191113

Answers distribution by country:

country
flagPoland
95%
95%
499113
flagthe United States
2%
2%
11217
flagGermany
1%
1%
5606
flagIndia
0%
0%
4458
flagthe United Kingdom
0%
0%
4250
flagUkraine
0%
0%
1546
flagRussia
0%
0%
1461
flagAustralia
0%
0%
1107
flagCanada
0%
0%
910
flagAustria
0%
0%
878

Quiz size

Number of active questions per language:

language
Italian language
1%
1
German language
17%
11
English language
23%
15
Polish language
21%
14
Russian language
9%
6
Ukrainian language
9%
6
Polish language
17%
11

The results are released under the CC-attribution license.

You may freely use it and re-distribute, but you must provide the link back to this page