2023 Monthly Challenges

1979 • 503 Readers • 420 pages • 3.8

1811 • 1,095 Readers • 432 pages • 3.8

1994 • 397 Readers • 286 pages • 3.9

1988 • 585 Readers • 361 pages • 4

-2100 • 797 Readers • 306 pages • 4.2

1986 • 506 Readers • 351 pages • 4

1972 • 431 Readers • 182 pages • 4.1

1937 • 2,613 Readers • 162 pages • 3.8

2011 • 354 Readers • 349 pages • 4

1990 • 2,400 Readers • 432 pages • 4.2

1996 • 525 Readers • 450 pages • 4.2

1996 • 297 Readers • 547 pages • 3.5

Added on 2022-01-13

2020 • 352 Readers • 160 pages • 4.3

1847 • 2,008 Readers • 376 pages • 3.6

2022 • 1,693 Readers • 258 pages • 4

2010 • 5 Readers • 336 pages

1994 • 352 Readers • 800 pages • 3.6

2021 • 22 Readers • 222 pages • 4.3

2012 • 1,511 Readers • 352 pages • 4.4

2024 • 216 Readers • 400 pages • 3.7

1939 • 2,269 Readers • 116 pages • 4.2

1939 • 1,496 Readers • 496 pages • 3.8

2018 • 659 Readers • 478 pages • 3.9

2001 • 188 Readers • 659 pages • 4.1

2022 • 569 Readers • 13h 27m • 3.6

1982 • 369 Readers • 241 pages • 3.7

2013 • 1,510 Readers • 366 pages • 4.1

1984 • 395 Readers • 427 pages • 3.9

2002 • 275 Readers • 605 pages • 3.7

2021 • 652 Readers • 493 pages • 4.1

19 • 2,010 Readers • 311 pages • 4.3

2008 • 178 Readers • 365 pages • 3.6

2021 • 214 Readers • 680 pages • 4.1

19 • 1,328 Readers • 544 pages • 3.6

2001 • 345 Readers • 694 pages • 3.1

Added on 2022-01-13

2018 • 1,789 Readers • 384 pages • 3.8