Related Clues:
- Best outcome
- Having no drawbacks
- Opposite of ephemeral
- Mysteriously different
- 10, perhaps
- Shining example
- Yardstick
- First publisher of the game Mouse Trap
- Like a score of 10 out of 10
- Toy company that launched Rubik's Cube
- Rating a 10, say
- 10 on a scale of 1 to 10, e.g.
- Unsurpassable
- Like a score of 10 of a possible 10
- Platonic thing