The Waterfall on Mars

Case #10 · Oct 10, 2026 · Hard · 4×5
— scenarios left

Last month the privately funded Ares rover sent home photographs of a frozen waterfall on Mars, and its backers raised another $400 million on the strength of them. This morning a hiker in Iceland recognised the waterfall. It's in Iceland.

Arlointern
Basilmission director
Celiabillionaire backer
Dexterbillionaire backer
Emilmission director
Franksecurity chief
Guscafeteria cook
Hanacafeteria cook
Irispress photographer
Junointern
Kirapress photographer
Lionelbillionaire backer
Milapress photographer
Norasecurity chief
Olivebillionaire backer
Petraintern
Queeniecafeteria cook
Rubysecurity chief
Sukimission director
Tessintern

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Spoiler-free hints

Keyboard: arrows move · I innocent · C criminal · H hint · N notes (then I/C pencil, 1–6 tags) · click a statement to dim it.

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Clues & Culprits › Archive › October 2026 › Oct 10, 2026 Hard

Oct 10, 2026 — Hard case

Last month the privately funded Ares rover sent home photographs of a frozen waterfall on Mars, and its backers raised another $400 million on the strength of them. This morning a hiker in Iceland recognised the waterfall. It's in Iceland.

This Hard case seats 20 suspects on a 4×5 grid. 18 of them carry a clue; the other 2 only have something to say about themselves. 6 of the steps can only be proven by reading two or more clues together. Every verdict you enter is checked against all the scenarios that still fit the statements on file, so a move only sticks when it is proven.

The opening statement

Nora the security chief starts the case already proven a criminal:

None of the cafeteria cooks is a criminal.— Nora, security chief (B4)

The lineup

Suspects stand in alphabetical order, left to right and top to bottom. Each belongs to one of Clues & Culprits’ twelve character classes — the badge on their nameplate. This case uses 6 of them, each cast as a role in the setting: interns, mission directors, billionaire backers, security chiefs, cafeteria cooks, press photographers. Clues about a role (“exactly one of the security chiefs”) count everyone in it.

SeatSuspectRole in this caseClass
A1ArlointernCourier
B1Basilmission directorOfficial
C1Celiabillionaire backerNoble
D1Dexterbillionaire backerNoble
A2Emilmission directorOfficial
B2Franksecurity chiefEnforcer
C2Guscafeteria cookCook
D2Hanacafeteria cookCook
A3Irispress photographerArtist
B3JunointernCourier
C3Kirapress photographerArtist
D3Lionelbillionaire backerNoble
A4Milapress photographerArtist
B4Norasecurity chiefEnforcer
C4Olivebillionaire backerNoble
D4PetrainternCourier
A5Queeniecafeteria cookCook
B5Rubysecurity chiefEnforcer
C5Sukimission directorOfficial
D5TessinternCourier

Stuck?

The in-game hint first points at the statement to re-read, then at the suspect you can prove, then shows the proof. For a gentler nudge, open the spoiler-free hints for Oct 10, 2026, or press Share to send a friend your exact board. New to the format? The deduction-puzzle guide covers the habits that unlock every step.

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