Six tiers with ocean names
Every accepted response lands in one of six bands, and the bands are named rather than numbered: Plankton at ten points, then upward through the water column to One in a Krillion at a hundred. The names are the only place the game explains itself, and after two dives you can read a friend's result from the tier alone. A perfect set of seven is 700, which the game draws as 7,000 metres of descent.