Knox et al
| Category | Heard | PPB | Easy % | Medium % | Hard % |
|---|---|---|---|---|---|
| Mythology | 11 | 10.91 | 82% | 18% | 9% |
| Philosophy (19th/20th Century) | 4 | 7.50 | 75% | 0% | 0% |
| Philosophy (Ancient / Medieval) | 3 | 16.67 | 100% | 33% | 33% |
| Philosophy (Ancient/Medieval) | 2 | 10.00 | 100% | 0% | 0% |
| Philosophy (Any/Other) | 2 | 0.00 | 0% | 0% | 0% |
| Philosophy (Contemporary) | 4 | 10.00 | 100% | 0% | 0% |
| Philosophy (Early Modern) | 2 | 15.00 | 100% | 50% | 0% |
| Religion (Any/Other) | 3 | 6.67 | 67% | 0% | 0% |
| Religion (Christianity) | 3 | 23.33 | 100% | 100% | 33% |
| Religion (Hinduism) | 2 | 5.00 | 50% | 0% | 0% |
| Religion (Islam) | 2 | 10.00 | 100% | 0% | 0% |