| System Length | Continent | Answer | % Correct |
|---|---|---|---|
| 402.0 km | Europe | London Underground | 99%
|
| 245.6 km | Europe | Paris Metro | 98%
|
| 796.0 km | Asia | Shanghai Metro | 98%
|
| 815.9 km | Asia | Beijing Metro | 97%
|
| 304.1 km | Asia | Tokyo Metro + Toei Subway | 96%
|
| 519.4 km | Europe | Moscow Metro | 94%
|
| 399.0 km | North America | New York City Subway | 94%
|
| 564.2 km | Asia | Seoul Metropolitan Subway | 91%
|
| 350.4 km | Asia | Delhi Metro | 85%
|
| 648.8 km | Asia | Guangzhou Metro | 84%
|
| 293.9 km | Europe | Madrid Metro | 83%
|
| 486.3 km | Asia | Wuhan Metro | 77%
|
| 243.3 km | Europe | Istanbul Metro | 75%
|
| 241.0 km | Asia | Singapore MRT | 74%
|
| 561.7 km | Asia | Chengdu Metro | 72%
|
| 337.0 km | Asia | Xi’an Metro | 72%
|
| 523.7 km | Asia | Chongqing Rail Transit | 71%
|
| 208.0 km | North America | Washington Metro | 69%
|
| 200.9 km | North America | Mexico City Metro | 68%
|
| 521.0 km | Asia | Nanjing Metro | 65%
|
| 555.4 km | Asia | Shenzhen Metro | 64%
|
| 301.0 km | Asia | Tianjin Metro | 62%
|
| 516.2 km | Asia | Hangzhou Metro | 60%
|
| 224.6 km | Asia | Tehran Metro | 54%
|
| 204.8 km | Asia | Kuala Lumpur Rapid KL | 50%
|
| 217.8 km | Asia | Changsha Metro | 43%
|
| 237.7 km | Asia | Dalian Metro | 41%
|
| 342.3 km | Asia | Qingdao Metro | 40%
|
| 285.6 km | Asia | Suzhou Rail Transit | 34%
|
| 216.0 km | Asia | Hefei Metro | 27%
|
| 344.2 km | Asia | Zhengzhou Metro | 26%
|