| 3,795 | 15 Biggest Cities per Continent with a Map | - | - |
| 1,570 | 20 Biggest Cities by Continent | - | - |
| 257 | 20 Biggest Irish Cities in English and Irish | - | - |
| 39,790 | 20 Chinese Cities Everyone Should Know | 0 | - |
| 26,167 | 20 Indian Cities Everyone Should Know | 0 | - |
| 542 | 30 Biggest European Cities in JetPunk Languages | - | - |
| 1,564 | 30 Biggest "Saint" Cities | - | - |
| 1,071 | 100 Biggest NATO Cities | - | - |
| 291 | American Cities Bigger than the Country's Capital | - | - |
| 172 | Arctic Cities | - | - |
| 378 | Biggest Cities by Peninsula #1 | - | - |
| 231 | Biggest Cities by Peninsula #2 | - | - |
| 143 | Biggest Cities by Peninsula #3 | - | - |
| 160 | Biggest Cities Further North Than New York | - | - |
| 224 | Biggest Cities in Countries with less than 10 Million | - | - |
| 159 | Biggest Cities in Democracies | - | - |
| 812 | Biggest Cities in Eastern Europe | - | - |
| 128 | Biggest Cities in EFTA Countries | - | - |
| 151 | Biggest Cities in Full Democracies | - | - |
| 290 | Biggest Cities in G7 Countries | - | - |
| 198 | Biggest Cities in Monarchies | - | - |
| 176 | Biggest Cities in Russian America | - | - |
| 274 | Biggest Cities in the British Isles by Country | - | - |
| 303 | Biggest Cities in the European Union | - | - |
| 80 | Biggest Cities in the Northwestern Hemisphere | - | - |
| 194 | Biggest Cities in the Tropics | - | - |
| 117 | Biggest Cities in the Western Hemisphere (hard) | - | - |
| 121 | Biggest Cities in "United" Countries | - | - |
| 614 | Biggest Cities in Western Europe - Easy | - | - |
| 161 | Biggest Cities in Western Europe - Insane | - | - |
| 147 | Biggest Cities Not on the Ocean | - | - |
| 201 | Biggest Cities with 5 or Fewer Letters by Continent | - | - |
| 1,517 | Biggest Cities With Exceptions - Extreme | - | - |
| 91 | Biggest European Cities Further West than the Prime Meridian | - | - |
| 128 | Biggest European Cities Not on the Ocean | - | - |
| 386 | Biggest European Cities on Islands | - | - |
| 183 | Biggest World Cities Ending in I | - | - |
| 285 | Biggest World Cities Ending in O | - | - |
| 130 | Biggest World Cities Ending in U | - | - |
| 259 | Biggest World Cities with Exceptions - Easy | - | - |
| 101 | Canadian Cities Bigger than their Capital | - | - |
| 128 | Cities Closest to New York City by Number of Inhabitants | - | - |
| 528 | Cities from Where You Can Fly into North Korea | - | - |
| 714 | Largest Cities in English-Speaking Countries in North America - Extreme | - | - |
| 96 | Largest Cities in English-Speaking Countries in North America - Hard | - | - |
| 181 | Largest Cities Located at Maximum 500 Miles away from Seattle | - | - |
| 80 | Largest Cities Located at Maximum 505 Miles away from Denver | - | - |
| 118 | Largest European Cities with Exceptions | - | - |
| 1,835 | Largest European Cities with Exceptions - EXTREME | - | - |
| 121 | Name the longest European City Name | - | - |
| 169 | Rivers by Capital | - | - |
| 203 | Safest / Least Safe European Capitals | - | - |
| 190 | Shrinking European Cities | - | - |
