| Tier | Texts |
|---|---|
| impossible | LV48 |
| very hard | LV9, LV26, LV32, LV35 |
| hard | LV3, LV38, LV49 |
| medium | VL16, VL22, LV28, LV34, LV40, LV41 |
| easy | LV7, LV10, LV11, LV14, VL18, LV33, LV36, LV43, LV45, LV46 |
| free | LV1, LV2, LV4, LV5, LV6, LV8, LV12, LV13, LV15, VL17, VL19, VL20, VL21, LV23, LV24, LV25, LV27, LV29, LV30, LV31, LV37, LV39, LV42, LV44, LV47 |
