| Letter | Length | Country | % Correct |
|---|---|---|---|
| O | 4 | Oman | 96%
|
| Y | 5 | Yemen | 94%
|
| Q | 5 | Qatar | 92%
|
| Z | 8 | Zimbabwe | 84%
|
| H | 8 | Honduras | 76%
|
| I | 9 | Indonesia | 76%
|
| U | 21 | United States of America | 76%
|
| F | 7 | Finland | 75%
|
| D | 28 | Democratic Republic of the Congo | 73%
|
| K | 10 | Kazakhstan/Kyrgyzstan | 73%
|
| V | 11 | Vatican City | 73%
|
| J | 7 | Jamaica | 71%
|
| A | 17 | Antigua and Barbuda | 65%
|
| R | 18 | Republic of the Congo | 63%
|
| P | 14 | Papua New Guinea | 53%
|
| S | 28 | Saint Vincent and the Grenadines | 53%
|
| C | 22 | Central African Republic | 51%
|
| L | 13 | Liechtenstein | 51%
|
| E | 16 | Equatorial Guinea | 45%
|
| B | 21 | Bosnia and Herzegovina | 43%
|
| T | 17 | Trinidad and Tobago | 43%
|
| G | 12 | Guinea-Bissau | 37%
|
| M | 15 | Marshall Islands | 35%
|
| N | 11 | Netherlands | 35%
|