Thursday 5 November 2026 · The robots · Steady
Kind of thinking: DeductionYukti #27 was a Steady robots puzzle, the puzzle for Thursday 5 November 2026. Yukti, a daily logic puzzle at playyukti.com, gives everyone the same puzzle each day. Here is the puzzle, and its shortest route with the reason for every step.
The puzzle
Which robots are faulty?
In this workshop, honest robots always tell the truth and faulty robots always lie. Mark each robot. Every mark must be a certain deduction, not a guess.
- Rivet says: “Gizmo and I are different kinds.”
- Gizmo says: “At most one of us is honest.”
- Pixel says: “At most 2 of us are honest.”
- Bolt says: “At most 2 of us are honest.”
What is the shortest route?
4 marks. Each step says why it's certain.
- 1
Gizmo is faulty.
Rivet's words settle it, whether Rivet is honest or faulty.
- 2
Pixel is honest.
If Pixel were faulty, Pixel's words would be true, but faulty robots never tell the truth.
- 3
Rivet is faulty.
Bolt's words settle it, whether Bolt is honest or faulty.
- 4
Bolt is honest.
Gizmo's words settle it, whether Gizmo is honest or faulty.
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