1. Name something that lives in a shell
The rarest answer starts with “X” (9 letters). Only 4 answers on this prompt score Deep Cut or better — think past the obvious.
Answer archive
Krillion answers — Sunday, December 20, 2026
One day of Krillion Infinite, preserved in full.
These are the 7 prompts from the Krillion Infinite daily dive for Sunday, December 20, 2026, with every accepted answer published by rarity tier — from the Plankton answer everyone gave, down to the One in a Krillion answer worth 100 points. Already played? Compare your dive honestly. Not played yet? If this page is today's date, close it and play first — spoilers are real down here.
Hints — a nudge before the answers
Want to almost find it yourself first? Each hint describes that prompt's rarest answer — its first letter, its length, and how much company it has in the deep tiers — without naming it. The full answers are right below, past the point of no return.
2. Name a famous physicist
The rarest answer starts with “M” (10 letters, 2 words). Only 4 answers on this prompt score Deep Cut or better — think past the obvious.
3. Name a famous science experiment
The rarest answer starts with “S” (23 letters, 2 words). Only 4 answers on this prompt score Deep Cut or better — think past the obvious.
4. Name a city built on seven hills
The rarest answer starts with “K” (7 letters). Only 4 answers on this prompt score Deep Cut or better — think past the obvious.
5. Name a dessert made with chocolate
The rarest answer starts with “S” (11 letters). Only 4 answers on this prompt score Deep Cut or better — think past the obvious.
6. Name a famous tennis player
The rarest answer starts with “B” (16 letters, 3 words). Only 4 answers on this prompt score Deep Cut or better — think past the obvious.
7. Name a civil rights leader
The rarest answer starts with “S” (15 letters, 2 words). Only 4 answers on this prompt score Deep Cut or better — think past the obvious.
The full answers
Name something that lives in a shell
🫧 Plankton (10 pts): Snail, Turtle, Crab, Clam
🤡 Too Clever (15 pts): Hermit crab, Oyster, Nudibranch?, Tortoise
🐟 Schooler (30 pts): Mussel, Lobster, Conch, Nautilus
🦑 Rare (60 pts): Abalone, Cockle, Whelk
🏮 Deep Cut (85 pts): Foraminifera, Chiton
🌟 One in a Krillion (100 pts): Xenophora, Sea butterfly
Name a famous physicist
🫧 Plankton (10 pts): Albert Einstein, Nikola Tesla
🤡 Too Clever (15 pts): Stephen Hawking, Isaac Newton
🐟 Schooler (30 pts): Galileo Galilei, Michael Faraday
🦑 Rare (60 pts): Werner Heisenberg, Marie Curie
🏮 Deep Cut (85 pts): Richard Feynman, Erwin Schrodinger
🌟 One in a Krillion (100 pts): Max Planck, Niels Bohr
Name a famous science experiment
🫧 Plankton (10 pts): Mentos and soda experiment, Baking soda volcano
🤡 Too Clever (15 pts): Double-slit experiment, Schrodinger's cat
🐟 Schooler (30 pts): Pavlov's dog experiment, Stanford prison experiment
🦑 Rare (60 pts): Rutherford gold-foil experiment, Galileo's leaning tower experiment
🏮 Deep Cut (85 pts): Michelson-Morley experiment, Millikan oil-drop experiment
🌟 One in a Krillion (100 pts): Schiehallion experiment, Eratosthenes' shadow experiment
Name a city built on seven hills
🫧 Plankton (10 pts): Rome
🤡 Too Clever (15 pts): Lisbon, Istanbul
🐟 Schooler (30 pts): Prague, Athens
🦑 Rare (60 pts): San Francisco, Seattle
🏮 Deep Cut (85 pts): Tirumala, Shimla
🌟 One in a Krillion (100 pts): Kampala, Amman
Name a dessert made with chocolate
🫧 Plankton (10 pts): Chocolate Cake, Chocolate Ice Cream
🤡 Too Clever (15 pts): Brownies
🐟 Schooler (30 pts): Chocolate Chip Cookies, Fudge
🦑 Rare (60 pts): Chocolate Fondue, Black Forest Cake
🏮 Deep Cut (85 pts): Tiramisu, Chocolate Mousse
🌟 One in a Krillion (100 pts): Sachertorte, Chocolate Soufflé
Name a famous tennis player
🫧 Plankton (10 pts): Rafael Nadal
🤡 Too Clever (15 pts): Roger Federer
🐟 Schooler (30 pts): Novak Djokovic, Serena Williams
🦑 Rare (60 pts): Andre Agassi, Steffi Graf
🏮 Deep Cut (85 pts): Pete Sampras, Martina Navratilova
🌟 One in a Krillion (100 pts): Billie Jean King, Rod Laver
Name a civil rights leader
🫧 Plankton (10 pts): Gandhi, Nelson Mandela
🤡 Too Clever (15 pts): Martin Luther King Jr., Susan B. Anthony
🐟 Schooler (30 pts): Malcolm X, Cesar Chavez
🦑 Rare (60 pts): Rosa Parks, John Lewis
🏮 Deep Cut (85 pts): Harriet Tubman, W.E.B. Du Bois
🌟 One in a Krillion (100 pts): Sojourner Truth, Frederick Douglass