| book list challenge 2021 | 0.17 | 0.8 | 2200 | 24 | 95 |
| book challenges for 2021 | 0.9 | 0.3 | 3585 | 24 | 98 |
| some novel challenges for 2021 | 0.85 | 0.1 | 8820 | 30 | 50 |
| challenge 1 book list | 1.18 | 0.2 | 2472 | 21 | 37 |
| challenge a book list | 1.09 | 0.3 | 8682 | 21 | 1 |
| top 10 challenged books of 2021 | 1.7 | 0.2 | 3937 | 31 | 93 |
| the challenge winners 2021 | 1.73 | 0.8 | 1920 | 26 | 8 |
| book list challenge 100 books | 1.91 | 0.4 | 9429 | 29 | 3 |
| the challenge cast 2021 | 0.35 | 0.3 | 7800 | 23 | 98 |
| challenge events near me 2021 | 1.69 | 0.9 | 1664 | 29 | 68 |
| goodreads book list 2021 | 0.86 | 0.5 | 5073 | 24 | 65 |
| browse book list challenges | 0.55 | 0.4 | 7129 | 27 | 37 |
| the challenge 2021 spoilers | 1.41 | 0.6 | 4137 | 27 | 10 |
| goodreads book challenge 2023 | 1.46 | 0.2 | 8599 | 29 | 36 |
| goodreads book challenge 2024 | 1.72 | 0.5 | 7100 | 29 | 75 |
| list new mild 2021 challenges | 1.01 | 0.2 | 393 | 29 | 39 |
| reading challenge checklist 2021 | 1.61 | 0.3 | 1855 | 32 | 87 |
| booklist best books 2021 | 1.04 | 0.8 | 2552 | 24 | 13 |
| list of challenged books 2022 | 1.83 | 0.4 | 667 | 29 | 61 |
| new books for 2021 | 1.36 | 0.2 | 3826 | 18 | 22 |
| hotly anticipated books of 2021 | 0.66 | 0.8 | 9585 | 31 | 50 |
| top 5 2021 books | 1.26 | 0.9 | 3525 | 16 | 5 |
| recap of the best books of 2021 | 0.97 | 0.6 | 2307 | 31 | 1 |
