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⚠️  Note

This is an archived version of the 2025 Key Clues Challenge website. For information on the upcoming event, visit https://keyclueschallenge.uwaterloo.ca/.

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Solution: The Light of Day
Answer: NUNDINAE

Written by The Enigmatologists

Begin by solving each crossword-type clue. The answers will come out in alphabetical order. Each answer will also contain a day of the week (clued by the title).

Clue Solution
Spousal support ALIMONY
A popular type of nut ALMOND
In the same family as buttercups ANEMONE
Flamingo flower ANTHURIUM
Law & Order SVU, S2 episode title ASUNDER
Not new, old, or blue BORROWED
A rank on a ship BOSUN
The corner of an eye CANTHUS
Correlation's partner CAUSATION
A voting member CONSTITUENT
Intense interest and enjoyment ENTHUSIASM
Sole distributor, perhaps? FISHMONGER
"You've got a ______ in me" FRIEND
Game you might throw a flick huck in FRISBEE
Sneeze follower GESUNDHEIT
Instrument in "Love Me Do" HARMONICA
Questioned someone for a job INTERVIEWED
What you make when faced with adversity LEMONADE
Bon Jovi, Bounce album MISUNDERSTOOD
An aid to help one remember MNEMONIC
After death POSTHUMOUS
Throb PULSATE
Covered in magnets and artwork REFRIGERATOR
Ganymede or Aryabhata SATELLITE
Half-human, half-goat, all Greek SATYR
Nancy Drew found a whispering one STATUE
Old timer, maybe? SUNDIAL
What the old lady did to the fly SWALLOWED
Follows lightning THUNDER
Harbour wave TSUNAMI
Type of hero that is not celebrated UNSUNG
Like a jack of all trades VERSATILE
Faith, hope, and charity VIRTUES
A simple machine WEDGE

We now have seven days of the week, along with numbers written using a seven-segment display. The red segments tell us how to match the days of the week to the individual segments.

If you group the clue answers by number, and then light up the segments that match the days of the week in each group, you get eight seven-segment display characters, which spell the puzzle's answer, NUNDINAE.

Authors' Notes

Early Roman calendars used an eight day week, with the additional day being called nundinae.

The puzzle’s full title (This puzzle will never see the light of day) is a tongue-in-cheek reference to the fact that this puzzle went through at least six different versions, each time getting feedback from testers that it was too hard.