| 931 | Which is the only country that... #1 | 2021-06-27 | 4 |
| 701 | Island Countries of the Caribbean Shape Quiz | 2021-05-24 | 7 |
| 162 | Keys of Beethoven's Piano Sonatas | 2021-04-18 | 0 |
| 149 | 1984... or Brave New World? | 2021-06-09 | 3 |
| 139 | Districts and Counties of Busan | 2021-08-25 | 0 |
| 111 | A Quiz about Liszt | 2021-03-03 | 0 |
| 107 | Districts of Seoul | 2021-06-11 | 0 |
| 100 | Word scramble- Classical composers | 2021-02-20 | 0 |
| 92 | Birth Country of Classical Composers | 2021-02-24 | 0 |
| 91 | Districts and Counties of Incheon | 2021-06-13 | 2 |
| 91 | Keys of Beethoven's Symphonies | 2021-02-26 | 0 |
| 86 | Smallest Countries Shape Quiz | 2021-02-27 | 3 |
| 75 | Cities and Counties of Gyeonggi | 2021-06-12 | 0 |
| 55 | Cities and Counties of North Gyeongsang | 2021-07-12 | 0 |
| 51 | Classical composers with missing letters #1 | 2021-02-19 | 0 |
| 50 | Most Guessed Countries Quiz | 2021-02-25 | 1 |
| 49 | Districts of Daejeon | 2021-06-24 | 0 |
| 46 | Cities and Counties of South Gyeongsang | 2021-07-15 | 1 |
| 46 | Districts and Counties of Daegu | 2021-08-19 | 0 |
| 45 | Famous Russian classical composers | 2021-02-19 | 0 |
| 43 | Kings of Joseon | 2021-07-06 | 0 |
| 41 | Tile select: Flags and Shapes of Countries | 2021-04-30 | 0 |
| 38 | Composers Died Young | 2021-02-27 | 0 |
| 35 | Classical composers with missing letters #2 | 2021-02-19 | 0 |
| 34 | Most Guessed Capitals Quiz | 2021-03-20 | 0 |
| 34 | Tile select: USA states | 2021-02-12 | 0 |
| 31 | Least Guessed Countries Quiz | 2021-02-24 | 0 |
| 28 | Keys of Paganini's Caprices | 2021-04-07 | 0 |
| 27 | OK Go Songs by Music Videos | 2021-05-05 | 0 |
| 27 | Cities and Counties of Gangwon | 2021-06-14 | 0 |
| 26 | Least Guessed Capitals Quiz | 2021-03-20 | 0 |
| 25 | Tile select: Elements of the periodic table | 2021-02-24 | 0 |
| 22 | Presidents of South Korea | 2021-07-06 | 0 |
| 21 | Keys of Grandes études de Paganini | 2021-04-06 | 0 |
| 20 | Most/Least Guessed States Quiz | 2021-03-12 | 0 |
| 19 | Keys of Hungarian Rhapsodies | 2021-02-19 | 0 |
| 18 | Cities and Counties of South Chungcheong | 2021-06-19 | 0 |
| 18 | Cities and Counties of North Chungcheong | 2021-06-18 | 0 |
| 17 | Change Fractions into Decimals | 2021-03-01 | 0 |
| 15 | Keys of Transcendental Etudes | 2021-02-22 | 0 |
| 11 | Tile select: Countries | 2021-02-08 | 0 |
| 11 | Towns, Townships and Neighborhoods of Sejong | 2021-07-03 | 0 |
| 7 | Cities and Counties of North Jeolla | 2021-11-06 | 0 |
