| 2023 | Challenge # | Name | Project(s) | Initial Date and Time (UTC) | Duration | Result links | Individuals | Teams | Tasks |
|---|---|---|---|---|---|---|---|---|---|
| 9 | Chris Caldwell Honorary | GFN-18 GFN-19 GFN-20 | 2023/12/10 | 19:00:00 | 10 days | Individuals | Teams | - | - | - |
| 8 | Christmas | ESP | 2023/10/31 | 13:00:00 | 5 days | Individuals | Teams | - | - | - |
| 7 | World Peace Day | SoB | 2023/09/13 | 11:00:00 | 10 days | Individuals | Teams | - | - | - |
| 6 | Chant at the Moon Day | AP-27 | 2023/08/15 | 02:00:00 | 3 days | Individuals | Teams | - | - | - |
| 5 | Math 2.0 Day | CW-Sieve | 2023/07/08 | 21:00:00 | 7 days | Individuals | Teams | - | - | - |
| 4 | Blaise Pascal's Birthday | 321 | 2023/06/19 | 20:00:00 | 5 days | Individuals | Teams | 463 | 112 | 75,488 |
| 3 | Gotthold Eisenstein's Birthday | PSP | 2023/04/16 | 16:00:00 | 7 days | Individuals | Teams | 411 | 97 | 22,380 |
| 2 | International Women's Day | SGS | 2023/03/08 | 15:00:00 | 1 day | Individuals | Teams | 509 | 118 | 2,656,836 |
| 1 | A Prime Chinese New Year | PPS-MEGA GFN-17-MEGA | 2023/01/22 | 12:00:00 | 3 days | Individuals | Teams | 841 | 152 | 2,361,254 |
| 2022 | Challenge # | Name | Project(s) | Initial Date and Time (UTC) | Duration | Result links | Individuals | Teams | Tasks |
| 9 | Great Internet Fermat Prime Search | GFN-21 GFN-22 DYFL | 2022/12/07 | 05:00:00 | 10 days | Individuals | Teams | 525 | 119 | 21,429 |
| 8 | Prime Meridian Day | CUL-LLR WOO-LLR | 2022/11/01 | 05:00:00 | 10 days | Individuals | Teams | 577 | 127 | 50,780 |
| 7 | World Space Week | TRP-LLR | 2022/10/04 | 12:00:00 | 7 days | Individuals | Teams | 566 | 130 | 125,104 |
| 6 | Riemann's Birthday | WW | 2022/09/17 | 20:00:00 | 3 days | Individuals | Teams | 425 | 93 | 382,878 |
| 5 | Pi Approximation Day | PPS-LLR | 2022/07/22 | 22:00:00 | 3 days | Individuals | Teams | 554 | 119 | 1,340,388 |
| 4 | M.C. Escher's Birthday | SR5-LLR | 2022/06/17 | 13:00:00 | 5 days | Individuals | Teams | 528 | 121 | 180,789 |
| 3 | Geek Pride Day | GFN-19 | 2022/05/25 | 18:00:00 | 5 days | Individuals | Teams | 444 | 95 | 117,428 |
| 2 | World Water Day | 321-LLR | 2022/03/21 | 03:21:00 | 5 days | Individuals | Teams | 563 | 121 | 76,653 |
| 1 | Heptadecagenarian | GFN-17-LOW GFN-17-MEGA | 2022/01/17 | 17:17:00 | 3 days | Individuals | Teams | 686 | 136 | 1,256,132 |
| 2021 | Challenge # | Name | Project(s) | Initial Date and Time (UTC) | Duration | Result links | Individuals | Teams | Tasks |
| 9 | Geminids Shower | GFN-21 GFN-22 DYFL | 2021/12/07 | 07:00:00 | 10 days | Individuals | Teams | 447 | 101 | 14,502 |
| 8 | Euler's Constant | AP27 | 2021/11/23 | 05:00:00 | 3 days | Individuals | Teams | 581 | 134 | 297,345 |
| 7 | Martin Gardner's Birthday | GCW-LLR | 2021/10/21 | 00:00:00 | 7 days | Individuals | Teams | 443 | 105 | 27,994 |
| 6 | Once In a Blue Moon | PSP-LLR | 2021/08/12 | 20:00:00 | 10 days | Individuals | Teams | 502 | 119 | 35,143 |
| 5 | World Emoji Day | GFN-17-Low | 2021/07/17 | 22:00:00 | 3 days | Individuals | Teams | 504 | 114 | 1,129,456 |
| 4 | PrimeGrid's 16th Birthday | ESP-LLR | 2021/06/12 | 13:00:00 | 5 days | Individuals | Teams | 422 | 108 | 35,670 |
| 3 | Yuri's Night | WW | 2021/04/11 | 18:00:00 | 3 days | Individuals | Teams | 481 | 109 | 285,605 |
| 2 | Sier"pi"nski's Birthday | SoB-LLR | 2021/03/14 | 12:00:00 | 10 days | Individuals | Teams | 476 | 108 | 16,018 |
| 1 | Good Riddance 2020! | PPS-DIV | 2021/01/14 | 00:00:00 | 5 days | Individuals | Teams | 688 | 134 | 520,493 |
| 2020 | Challenge # | Name | Project(s) | Initial Date and Time (UTC) | Duration | Result links | Individuals | Teams | Tasks |
| 9 | Great Conjunction | GFN-18 GFN-19 GFN-20 | 2020/12/21 | 13:22:00 | 10 days | Individuals | Teams | 929 | 171 | 348,094 |
| 8 | Magellan 500th Anniversary | CUL-LLR WOO-LLR | 2020/11/18 | 18:00:00 | 10 days | Individuals | Teams | 728 | 151 | 59,142 |
| 7 | Évariste Galois | PPS-DIV | 2020/10/20 | 06:00:00 | 5 days | Individuals | Teams | 821 | 158 | 772,022 |
| 6 | International Bacon Day | PPSE-LLR | 2020/09/03 | 00:00:00 | 3 days | Individuals | Teams | 686 | 135 | 3,166,657 |
| 5 | Katherine Johnson Memorial | TRP-LLR | 2020/07/24 | 20:00:00 | 7 days | Individuals | Teams | 545 | 109 | 93,089 |
| 4 | Alan Turing's Birthday | PPS-Sieve | 2020/06/23 | 22:00:00 | 3 days | Individuals | Teams | 867 | 158 | 957,065 |
| 3 | Sophie Germain's Birthday | SGS-LLR | 2020/04/01 | 12:00:00 | 3 days | Individuals | Teams | 902 | 164 | 3,653,132 |
| 2 | Year of the Rat | SR5-LLR | 2020/03/12 | 06:00:00 | 5 days | Individuals | Teams | 575 | 107 | 119,005 |
| 1 | International Education Day | 321-Sieve | 2020/01/24 | 00:00:00 | 1 day | Individuals | Teams | 610 | 113 | 307,334 |
| 2019 | Challenge # | Name | Project(s) | Initial Date and Time (UTC) | Duration | Result links | Individuals | Teams | Tasks |
| 10 | Aussie, Aussie, Aussie! Oi! Oi! Oi! Summer Solstice | GFN-21 GFN-22 GFN-DYFL | 2019/12/12 | 04:19:00 | 10 days | Individuals | Teams | 489 | 93 | 11,886 |
| 9 | Transit of Mercury Across the Sun | PSP-LLR | 2019/11/01 | 18:04:00 | 10 days | Individuals | Teams | 406 | 94 | 18,177 |
| 8 | 50 years First ARPANET Connection | 321-LLR | 2019/10/24 | 00:00:00 | 5 days | Individuals | Teams | 492 | 104 | 39,525 |
| 7 | World Maths Day | PPS-DIV | 2019/10/10 | 18:00:00 | 5 days | Individuals | Teams | 592 | 123 | 477,127 |
| 6 | Oktoberfest | AP27 | 2019/09/21 | 11:00:00 | 5 days | Individuals | Teams | 686 | 133 | 303,064 |
| 5 | Lennart Vogel Honorary | ESP-LLR | 2019/08/03 | 00:00:00 | 7 days | Individuals | Teams | 409 | 96 | 25,210 |
| 4 | 50th Anniversary of the Moon Landing | PPS-LLR | 2019/07/15 | 20:17:00 | 5 days | Individuals | Teams | 809 | 172 | 977,155 |
| 3 | Hans Ivar Riesel's 90th Birthday | TRP-LLR | 2019/05/24 | 00:00:00 | 7 days | Individuals | Teams | 563 | 115 | 59,865 |
| 2 | Year of the Pig | GCW-LLR | 2019/03/05 | 18:00:00 | 5 days | Individuals | Teams | 341 | 87 | 15,969 |
| 1 | Conjunction of Venus & Jupiter | SoB-LLR | 2019/01/07 | 05:43:00 | 15 days | Individuals | Teams | 388 | 87 | 10,567 |
| 2018 | Challenge # | Name | Project(s) | Initial Date and Time (UTC) | Duration | Result links | Individuals | Teams | Tasks |
| 9 | Winter Solstice | GFN-21 | 2018/12/11 | 22:23:00 | 10 days | Individuals | Teams | 473 | 98 | 17,601 |
| 8 | Leonids Shower | AP27 | 2018/11/17 | 12:00:00 | 3 days | Individuals | Teams | 564 | 119 | - |
| 7 | Halloween | WOO-LLR | 2018/10/24 | 23:59:59 | 7 days | Individuals | Teams | 334 | 80 | - |
| 6 | Oktoberfest | CUL-LLR | 2018/09/15 | 18:00:00 | 7 days | Individuals | Teams | 333 | 76 | - |
| 5 | Solar Eclipse | PPS-LLR | 2018/08/10 | 18:00:00 | 3 days | Individuals | Teams | 639 | 140 | - |
| 4 | World Cup | SR5-LLR | 2018/06/14 | 00:00:00 | 5 days | Individuals | Teams | 533 | 113 | - |
| 3 | Mathematics Awareness Month | ESP-LLR | 2018/04/03 | 12:00:00 | 5 days | Individuals | Teams | 348 | 82 | - |
| 2 | Year of the Dog | 321-LLR | 2018/03/16 | 18:00:00 | 7 days | Individuals | Teams | 501 | 97 | - |
| 1 | Happy New Year | SoB-LLR | 2018/01/01 | 00:00:00 | 15 days | Individuals | Teams | 520 | 109 | - |
| 2017 | Challenge # | Name | Project(s) | Initial Date and Time (UTC) | Duration | Result links | Individuals | Teams | Tasks |
| 8 | Winter Solstice | PPS-Sieve | 2017/12/18 | 16:28:00 | 3 days | Individuals | Teams | 1,063 | 185 | - |
| 7 | Pierre de Fermat's Birthday | GFN-15 GFN-16 GFN-17-Low | 2017/11/17 | 12:00:00 | 3 days | Individuals | Teams | 814 | 144 | - |
| 6 | Diwali/Deepavali | TRP-LLR | 2017/10/18 | 00:00:00 | 5 days | Individuals | Teams | 501 | 101 | - |
| 5 | Number Theory Week | 321-LLR | 2017/09/03 | 18:00:00 | 5 days | Individuals | Teams | 474 | 100 | - |
| 4 | Solar Eclipse | GCW-LLR | 2017/08/20 | 18:00:00 | 3 days | Individuals | Teams | 368 | 84 | - |
| 3 | PrimeGrid's Birthday | SGS-LLR | 2017/06/12 | 00:00:00 | 1 day | Individuals | Teams | 588 | 130 | - |
| 2 | Mathematics Awareness Month | PSP-LLR | 2017/04/07 | 12:00:00 | 15 days | Individuals | Teams | 737 | 142 | - |
| 1 | Isaac Newton's Birthday | GCW-Sieve | 2017/01/03 | 18:00:00 | 10 days | Individuals | Teams | 891 | 160 | - |
| 2016 | Challenge # | Name | Project(s) | Initial Date and Time (UTC) | Duration | Result links | Individuals | Teams | Tasks |
| 9 | Winter Solstice | PPS-Sieve | 2016/12/18 | 10:44:00 | 3 days | Individuals | Teams | 1,210 | 211 | - |
| 8 | Wallis is Born | AP27 | 2016/11/18 | 18:00:00 | 5 days | Individuals | Teams | 573 | 101 | - |
| 7 | World Space Week Kickoff | SGS-LLR | 2016/10/03 | 18:00:00 | 1 day | Individuals | Teams | 650 | 133 | - |
| 6 | Summer Paralympics | ESP-LLR | 2016/09/02 | 18:00:00 | 5 days | Individuals | Teams | 422 | 78 | - |
| 5 | Summer Olympics | TRP-Sieve | 2016/08/02 | 21:00:00 | 3 days | Individuals | Teams | 816 | 155 | - |
| 4 | Summer Solstice | PPS-Mega | 2016/06/20 | 22:34:00 | 5 days | Individuals | Teams | 489 | 99 | - |
| 3 | Cullen Birthday | WOO-LLR CUL-LLR | 2016/04/19 | 18:00:00 | 9 days | Individuals | Teams | 408 | 87 | - |
| 2 | From Pi to Paddy | SR5-LLR | 2016/03/14 | 03:14:15 | 3 days | Individuals | Teams | 409 | 90 | - |
| 1 | Makar Sankranti | GFN-17-Mega GFN-18 GFN-19 GFN-20 GFN-21 GFN-22 | 2016/01/07 | 18:00:00 | 8 days | Individuals | Teams | 596 | 122 | - |
| 2015 | Challenge # | Name | Project(s) | Initial Date and Time (UTC) | Duration | Result links | Individuals | Teams | Tasks |
| 9 | Winter Solstice | PPS-Sieve | 2015/12/19 | 04:48:00 | 3 days | Individuals | Teams | 982 | 191 | - |
| 8 | Leonids Shower | SGS-LLR | 2015/11/14 | 18:00:00 | 3 days | Individuals | Teams | 890 | 179 | - |
| 7 | World Animal Day | TRP-LLR | 2015/10/04 | 18:00:00 | 5 days | Individuals | Teams | 591 | 127 | - |
| 6 | Reign Record | CUL-LLR | 2015/09/10 | 18:00:00 | 5 days | Individuals | Teams | 277 | 59 | - |
| 5 | Perseid Shower | TRP-Sieve | 2015/08/10 | 18:00:00 | 2 days | Individuals | Teams | 693 | 145 | - |
| 4 | PrimeGrid Birthday | SOB PSP ESP-Sieve | 2015/06/12 | 18:00:00 | 3 days | Individuals | Teams | 1,594 | 169 | - |
| 3 | World Expo | GFN-Short GFN-WR | 2015/04/23 | 18:00:00 | 8 days | Individuals | Teams | 470 | 98 | - |
| 2 | Solar Eclipse | SR5-LLR | 2015/03/15 | 07:41:00 | 5 days | Individuals | Teams | 857 | 154 | - |
| 1 | Year of the Sheep | SOB-LLR PSP-LLR ESP-LLR | 2015/01/03 | 18:00:00 | 8 days | Individuals | Teams | 842 | 141 | - |
| 2014 | Challenge # | Name | Project(s) | Initial Date and Time (UTC) | Duration | Result links | Individuals | Teams | Tasks |
| 11 | Winter Solstice | PPS-Sieve | 2014/12/18 | 23:03:00 | 3 days | Individuals | Teams | 1,216 | 224 | - |
| 10 | Saint Nicholas' | SGS-LLR | 2014/12/05 | 00:00:00 | 1 day | Individuals | Teams | 821 | 160 | - |
| 9 | Leonids | 321-LLR | 2014/11/19 | 18:00:00 | 5 days | Individuals | Teams | 738 | 138 | - |
| 8 | World Animal Day | TRP-LLR | 2014/10/04 | 18:00:00 | 5 days | Individuals | Teams | 759 | 161 | - |
| 7 | Perseid Shower | TRP-Sieve | 2014/08/12 | 18:00:00 | 2 days | Individuals | Teams | 786 | 164 | - |
| 6 | Sovereign | SR5-LLR | 2014/06/25 | 18:00:00 | 3 days | Individuals | Teams | 697 | 127 | - |
| 5 | Race to the New Moon | CUL-LLR | 2014/05/20 | 19:43:00 | 8 days | Individuals | Teams | 662 | 129 | - |
| 4 | Shakespeare's Birthday | PPS-LLR | 2014/04/20 | 16:16:00 | 3 days | Individuals | Teams | 1,582 | 273 | - |
| 3 | Double Top Secret Mystery | PSP-LLR | 2014/03/01 | 18:00:00 | 15 days | Individuals | Teams | 1,026 | 181 | - |
| 2 | Year of the Horse - Pony Express | GFN-Short | 2014/01/03 | 18:00:00 | 15 days | Individuals | Teams | 644 | 136 | - |
| 1 | Year of the Horse - Stallion Edition | GFN-WR | 2014/01/03 | 18:00:00 | 15 days | Individuals | Teams | 175 | 52 | - |
| 2013 | Challenge # | Name | Project(s) | Initial Date and Time (UTC) | Duration | Result links | Individuals | Teams | Tasks |
| 9 | Winter Solstice | PPS-Sieve | 2013/12/18 | 17:11:00 | 3 days | Individuals | Teams | 1,337 | 217 | - |
| 8 | Leonids | 321-LLR | 2013/11/14 | 18:00:00 | 5 days | Individuals | Teams | 1,072 | 181 | - |
| 7 | World Animal Day | TRP LLR | 2013/10/04 | 18:00:00 | 5 days | Individuals | Teams | 1,149 | 198 | - |
| 6 | Perseid Shower | TRP Sieve | 2013/08/12 | 18:00:00 | 2 days | Individuals | Teams | 1,114 | 206 | - |
| 5 | Father's Day | SR5 LLR | 2013/06/15 | 18:00:00 | 3 days | Individuals | Teams | 944 | 156 | - |
| 4 | Low Country Festivities | WOO LLR | 2013/04/29 | 18:00:00 | 8 days | Individuals | Teams | 826 | 162 | - |
| 3 | Equinox | PPS LLR | 2013/03/17 | 11:02:00 | 5 days | Individuals | Teams | 2,542 | 365 | - |
| 2 | Valentine's Day | SGS LLR | 2013/02/14 | 18:00:00 | 1 day | Individuals | Teams | 1,030 | 180 | - |
| 1 | Year of the Snake | GFN (Short) | 2013/01/04 | 18:00:00 | 13 days | Individuals | Teams | 810 | 166 | - |
| 2012 | Challenge # | Name | Project(s) | Initial Date and Time (UTC) | Duration | Result links | Individuals | Teams | Tasks |
| 8 | Winter Solstice | PPS Sieve | 2012/12/18 | 11:11:00 | 3 days | Individuals | Teams | 1,968 | 297 | - |
| 7 | 321 Blast Off | 321 LLR | 2012/11/01 | 18:00:00 | 8 days | Individuals | Teams | 1,651 | 244 | - |
| 6 | An Apple a Day | PPS LLR | 2012/10/05 | 18:00:00 | 1 day | Individuals | Teams | 1,200 | 215 | - |
| 5 | Olympics | TRP Sieve | 2012/08/03 | 18:00:00 | 2 days | Individuals | Teams | 850 | 154 | - |
| 4 | Alan Turing Year | GFN | 2012/06/20 | 23:09:00 | 3 days | Individuals | Teams | 430 | 109 | - |
| 3 | Cinco de Mayo | TRP LLR | 2012/05/05 | 18:00:00 | 5 days | Individuals | Teams | 1,269 | 224 | - |
| 2 | Marie-Sophie Germain | SGS LLR | 2012/04/01 | 18:00:00 | 2 days | Individuals | Teams | 2,090 | 316 | - |
| 1 | Year of the Dragon | PPS LLR | 2012/01/23 | 18:00:00 | 5 days | Individuals | Teams | 3,242 | 449 | - |
| 2011 | Challenge # | Name | Project(s) | Initial Date and Time (UTC) | Duration | Result links | Individuals | Teams | Tasks |
| 9 | Winter Solstice | PPS Sieve | 2011/12/19 | 05:30:00 | 3 days | Individuals | Teams | 2,776 | 385 | - |
| 8 | Leonids | 321 LLR | 2011/11/18 | 18:00:00 | 5 days | Individuals | Teams | 1,599 | 255 | - |
| 7 | Equinox | WOO LLR | 2011/09/23 | 18:00:00 | 13 days | Individuals | Teams | 1,765 | 284 | - |
| 6 | Dog Days of Summer | PPS LLR | 2011/08/26 | 18:00:00 | 2 days | Individuals | Teams | 1,736 | 295 | - |
| 5 | PrimeGrid's Birthday/Summer Solstice | CW Sieve | 2011/06/20 | 17:16:00 | 1 day | Individuals | Teams | 811 | 147 | - |
| 4 | Cinco de Mayo | TRP LLR | 2011/05/05 | 18:00:00 | 8 days | Individuals | Teams | 1,126 | 208 | - |
| 3 | Marie-Sophie Germain | SGS LLR | 2011/04/01 | 18:00:00 | 2 days | Individuals | Teams | 2,062 | 324 | - |
| 2 | World Maths Day | TRP Sieve | 2011/03/01 | 18:00:00 | 1 day | Individuals | Teams | 709 | 125 | - |
| 1 | Year of the Rabbit | PPS LLR | 2011/02/03 | 18:00:00 | 3 days | Individuals | Teams | 2,546 | 373 | - |
| 2010 | Challenge # | Name | Project(s) | Initial Date and Time (UTC) | Duration | Result links | Individuals | Teams | Tasks |
| 9 | Winter Solstice | PPSE Sieve | 2010/12/18 | 18:00:00 | 3 days | Individuals | Teams | 2,109 | 283 | - |
| 8 | Leonids | SGS LLR | 2010/11/17 | 18:00:00 | 1 day | Individuals | Teams | 1,443 | 221 | - |
| 7 | Calendula | PSP LLR | 2010/09/24 | 18:00:00 | 13 days | Individuals | Teams | 883 | 146 | - |
| 6 | Dog Days of Summer | 321 Sieve | 2010/08/20 | 18:00:00 | 2 days | Individuals | Teams | 984 | 145 | - |
| 5 | Full Moon | PPSE LLR | 2010/07/25 | 18:00:00 | 1 day | Individuals | Teams | 917 | 144 | - |
| 4 | PrimeGrid's Birthday/Summer Solstice | TRP Sieve | 2010/06/16 | 11:28:00 | 5 days | Individuals | Teams | 1,297 | 167 | - |
| 3 | Earth Day | 321 LLR | 2010/04/22 | 18:00:00 | 8 days | Individuals | Teams | 1,630 | 215 | - |
| 2 | Ides Of March | PSP Sieve | 2010/03/15 | 18:00:00 | 1 day | Individuals | Teams | 1,298 | 169 | - |
| 1 | Year of the Tiger | PPS LLR | 2010/02/14 | 18:00:00 | 3 days | Individuals | Teams | 1,838 | 254 | - |
| 2009 | Challenge # | Name | Project(s) | Initial Date and Time (UTC) | Duration | Result links | Individuals | Teams | Tasks |
| 9 | Winter Solstice | AP 26 | 2009/12/18 | 00:00:00 | 3 days | Individuals | Teams | 1,814 | 226 | - |
| 8 | Giving Thanks | PSP Sieve | 2009/11/13 | 00:00:00 | 1 day | Individuals | Teams | 1,112 | 155 | - |
| 7 | Harvest Festival | PPS LLR | 2009/10/02 | 00:00:00 | 2 days | Individuals | Teams | 1,360 | 200 | - |
| 6 | Dog Days of Summer | Woodall LLR | 2009/08/18 | 00:00:00 | 5 days | Individuals | Teams | 314 | 60 | - |
| 5 | New Moon | AP26 | 2009/07/21 | 00:00:00 | 1 day | Individuals | Teams | 687 | 120 | - |
| 4 | PrimeGrid's Birthday/Summer Solstice | PSP LLR | 2009/06/12 | 00:00:00 | 9 days | Individuals | Teams | 467 | 85 | - |
| 3 | Showers to Flowers | PSP Sieve | 2009/04/29 | 00:00:00 | 2 days | Individuals | Teams | 2,093 | 261 | - |
| 2 | Ides Of March | PPS LLR | 2009/03/15 | 00:00:00 | 1 day | Individuals | Teams | 901 | 148 | - |
| 1 | Year of the Ox | 321 LLR | 2009/01/26 | 00:00:00 | 5 days | Individuals | Teams | 586 | 132 | - |
| 2008 | Challenge # | Name | Project(s) | Initial Date and Time (UTC) | Duration | Result links | Individuals | Teams | Tasks |
| 8 | Winter Solstice | PSP Sieve | 2008/12/17 | 00:00:00 | 4 days | Individuals | Teams | 2,112 | 263 | - |
| 7 | Prime Time (Reloaded) | PPS LLR | 2008/11/28 | 00:00:00 | 2 days | Individuals | Teams | 642 | 130 | - |
| 6 | Back to the Future | Woodall LLR | 2008/09/13 | 00:00:00 | 14 days | Individuals | Teams | 1,093 | 203 | - |
| 5 | Dog Days of Summer | 321 LLR | 2008/08/22 | 00:00:00 | 3 days | Individuals | Teams | 790 | 143 | - |
| 4 | Lunar Landing | PSP Sieve | 2008/07/18 | 00:00:00 | 3 days | Individuals | Teams | 1,331 | 193 | - |
| 3 | PrimeGrid's Birthday | TPS LLR | 2008/06/12 | 00:00:00 | 1 day | Individuals | Teams | 374 | 84 | - |
| 2 | The Drive for Five | 321 LLR | 2008/05/15 | 00:00:00 | 17 days | Individuals | Teams | 1,678 | 254 | - |
| 1 | The Ides Of March | PSP Sieve | 2008/03/15 | 00:00:00 | 1 day | Individuals | Teams | 100 | 50 | - |
File generated on 2023/06/26 at 00:44:49 UTC