A designated answer worth 100 points
One in a Krillion is the highest of the six score tiers. It adds 1,000 metres to a dive. Seven such answers reach 7,000 metres. In the LudyPlay version, tiers are assigned to answers in the question pack.
Think in subcategories
If a prompt asks for an instrument, mentally list families, then narrow to one you know. For a place-name prompt, try a region you know well. Check every constraint before submitting.
Read the other tiers
Plankton scores 10, Too Clever 15, Schooler 30, Rare 60 and Deep Cut 85. The post-dive answer sheet shows which examples earned each tier.