| 2,234 | 15 Biggest Cities per Continent with a Map | - | - |
| 1,209 | 20 Biggest Cities by Continent | - | - |
| 192 | 20 Biggest Irish Cities in English and Irish | - | - |
| 34,603 | 20 Chinese Cities Everyone Should Know | 0 | - |
| 22,981 | 20 Indian Cities Everyone Should Know | 0 | - |
| 420 | 30 Biggest European Cities in JetPunk Languages | - | - |
| 620 | 30 Biggest "Saint" Cities | - | - |
| 844 | 100 Biggest NATO Cities | - | - |
| 195 | American Cities Bigger than the Country's Capital | - | - |
| 129 | Arctic Cities | - | - |
| 253 | Biggest Cities by Peninsula #1 | - | - |
| 158 | Biggest Cities by Peninsula #2 | - | - |
| 100 | Biggest Cities by Peninsula #3 | - | - |
| 124 | Biggest Cities Further North Than New York | - | - |
| 178 | Biggest Cities in Countries with less than 10 Million | - | - |
| 142 | Biggest Cities in Democracies | - | - |
| 767 | Biggest Cities in Eastern Europe | - | - |
| 102 | Biggest Cities in EFTA Countries | - | - |
| 132 | Biggest Cities in Full Democracies | - | - |
| 262 | Biggest Cities in G7 Countries | - | - |
| 151 | Biggest Cities in Monarchies | - | - |
| 147 | Biggest Cities in Russian America | - | - |
| 241 | Biggest Cities in the British Isles by Country | - | - |
| 274 | Biggest Cities in the European Union | - | - |
| 69 | Biggest Cities in the Northwestern Hemisphere | - | - |
| 175 | Biggest Cities in the Tropics | - | - |
| 106 | Biggest Cities in the Western Hemisphere (hard) | - | - |
| 99 | Biggest Cities in "United" Countries | - | - |
| 548 | Biggest Cities in Western Europe - Easy | - | - |
| 136 | Biggest Cities in Western Europe - Insane | - | - |
| 114 | Biggest Cities Not on the Ocean | - | - |
| 171 | Biggest Cities with 5 or Fewer Letters by Continent | - | - |
| 1,436 | Biggest Cities With Exceptions - Extreme | - | - |
| 79 | Biggest European Cities Further West than the Prime Meridian | - | - |
| 103 | Biggest European Cities Not on the Ocean | - | - |
| 328 | Biggest European Cities on Islands | - | - |
| 156 | Biggest World Cities Ending in I | - | - |
| 235 | Biggest World Cities Ending in O | - | - |
| 106 | Biggest World Cities Ending in U | - | - |
| 229 | Biggest World Cities with Exceptions - Easy | - | - |
| 80 | Canadian Cities Bigger than their Capital | - | - |
| 115 | Cities Closest to New York City by Number of Inhabitants | - | - |
| 474 | Cities from Where You Can Fly into North Korea | - | - |
| 690 | Largest Cities in English-Speaking Countries in North America - Extreme | - | - |
| 89 | Largest Cities in English-Speaking Countries in North America - Hard | - | - |
| 165 | Largest Cities Located at Maximum 500 Miles away from Seattle | - | - |
| 72 | Largest Cities Located at Maximum 505 Miles away from Denver | - | - |
| 89 | Largest European Cities with Exceptions | - | - |
| 1,702 | Largest European Cities with Exceptions - EXTREME | - | - |
| 104 | Name the longest European City Name | - | - |
| 121 | Rivers by Capital | - | - |
| 163 | Safest / Least Safe European Capitals | - | - |
| 162 | Shrinking European Cities | - | - |
