| 3,750 | 15 Biggest Cities per Continent with a Map | - | - |
| 1,548 | 20 Biggest Cities by Continent | - | - |
| 245 | 20 Biggest Irish Cities in English and Irish | - | - |
| 39,432 | 20 Chinese Cities Everyone Should Know | 0 | - |
| 25,933 | 20 Indian Cities Everyone Should Know | 0 | - |
| 537 | 30 Biggest European Cities in JetPunk Languages | - | - |
| 1,550 | 30 Biggest "Saint" Cities | - | - |
| 1,060 | 100 Biggest NATO Cities | - | - |
| 282 | American Cities Bigger than the Country's Capital | - | - |
| 171 | Arctic Cities | - | - |
| 370 | Biggest Cities by Peninsula #1 | - | - |
| 224 | Biggest Cities by Peninsula #2 | - | - |
| 139 | Biggest Cities by Peninsula #3 | - | - |
| 157 | Biggest Cities Further North Than New York | - | - |
| 219 | Biggest Cities in Countries with less than 10 Million | - | - |
| 158 | Biggest Cities in Democracies | - | - |
| 811 | Biggest Cities in Eastern Europe | - | - |
| 127 | Biggest Cities in EFTA Countries | - | - |
| 150 | Biggest Cities in Full Democracies | - | - |
| 289 | Biggest Cities in G7 Countries | - | - |
| 196 | Biggest Cities in Monarchies | - | - |
| 175 | Biggest Cities in Russian America | - | - |
| 272 | Biggest Cities in the British Isles by Country | - | - |
| 299 | Biggest Cities in the European Union | - | - |
| 79 | Biggest Cities in the Northwestern Hemisphere | - | - |
| 193 | Biggest Cities in the Tropics | - | - |
| 117 | Biggest Cities in the Western Hemisphere (hard) | - | - |
| 120 | Biggest Cities in "United" Countries | - | - |
| 607 | Biggest Cities in Western Europe - Easy | - | - |
| 159 | Biggest Cities in Western Europe - Insane | - | - |
| 144 | Biggest Cities Not on the Ocean | - | - |
| 199 | Biggest Cities with 5 or Fewer Letters by Continent | - | - |
| 1,512 | Biggest Cities With Exceptions - Extreme | - | - |
| 90 | Biggest European Cities Further West than the Prime Meridian | - | - |
| 126 | Biggest European Cities Not on the Ocean | - | - |
| 379 | Biggest European Cities on Islands | - | - |
| 182 | Biggest World Cities Ending in I | - | - |
| 284 | Biggest World Cities Ending in O | - | - |
| 128 | Biggest World Cities Ending in U | - | - |
| 259 | Biggest World Cities with Exceptions - Easy | - | - |
| 99 | Canadian Cities Bigger than their Capital | - | - |
| 127 | Cities Closest to New York City by Number of Inhabitants | - | - |
| 524 | Cities from Where You Can Fly into North Korea | - | - |
| 712 | Largest Cities in English-Speaking Countries in North America - Extreme | - | - |
| 95 | Largest Cities in English-Speaking Countries in North America - Hard | - | - |
| 179 | Largest Cities Located at Maximum 500 Miles away from Seattle | - | - |
| 79 | Largest Cities Located at Maximum 505 Miles away from Denver | - | - |
| 117 | Largest European Cities with Exceptions | - | - |
| 1,826 | Largest European Cities with Exceptions - EXTREME | - | - |
| 120 | Name the longest European City Name | - | - |
| 165 | Rivers by Capital | - | - |
| 200 | Safest / Least Safe European Capitals | - | - |
| 188 | Shrinking European Cities | - | - |
