In Nancy Drew: Message in a Haunted Mansion, the second puzzle on the pyramid is a phoenix slider puzzle. Here is how I solved the puzzle: (feel free to copy/paste onto a document to print out for reference if desired.
U = Up,
D = Down,
R = Right,
L = Left
Junior Detective:
- URURDL
- LDRUUL
- DRURDD
- LUULDR
- RULDDR
- UULLDD
- RUULDD
- RULURDDL
Senior Detective:
- URUULDDRURU
- LLDDRURDDLU
- UURDRULDDR
- ULDDURDLUU
- RDDLUUULDDL
- DRUURULDDLU
- URDDRDLUURD
- LUURDDLUULD
- DDRRULDLUUR
- DDLUURUDRDL
- UULDDRULURD
- DLURULDRDLU
- URDLDD.
