Are YOU a spelling whizz? Put your knowledge to the test with this tricky 20-question quiz - and the creator claims you need an IQ of 149 to score full marks (21 Pics)

This tricky spelling test has left internet users scratching their heads. 

The multiple choice quiz asks players to choose the correct spelling from two possible answers.  

Its creator, Terry Stein, who shared the quiz on Playbuzz, claims its so difficult that only those with an IQ of 149 or above will score full marks.

If you think you have what it takes, scroll down to take the test. 

But the answers are at the bottom of the page - so no cheating... 

Answers  

1. Twelfth
2. Exhilarate
3. Inoculate
4. Leisure
5. Conscience
6. Noticeable
7. Paradigm 
8. Hierarchy
9. Idiosyncratic 
10. Threshold 
11. Plenitude
12. Indispensable 
13. Embezzlement 
14. Committed 
15. Pastime 
16. Arcane 
17. Transparent 
18. Rhyme 
19. Penurious 
20. Stubbornly