Roboku
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Case 43: who took the Ruby Brooch?
At 3:55 this morning, the alarm went off at the theater. After the authorities and the venue's staff arrived, an inventory was carried out, and it turned out that the Ruby Brooch, which had been on display in the Rehearsal Room, was missing. Help the police unmask the thief.
The board
- 1Makeup Room
- 2Restrooms
- 3Lobby
- 4Props Room
- 5Stage
- 6Dressing Room
- 7Orchestra Pit
- 8Rehearsal Room
- 9Costume Room
- 10Office
- 11Storage Room
- 12Café
- Plant: no character can stand on its cell, but the stolen item can be there.
- Seat: anyone can be on it.
- Shelf: no character can stand on its cell, but the stolen item can be there.
- Table: nothing can be on its cell.
- Screen: nothing can be on its cell.
Suspects and clues
- MMartha
She's 6 columns away from the Props Room. - SSven
He's right next to the Dressing Room. - PPriya
She's 2 rows away from the Props Room. - XXiomara
She's in column D. - NNoah
He's in row 6. - GGrace
She's in the Dressing Room. - DDana
She's in the Café. - YYusuf
He's 1 row away from the Dressing Room. - RRuby Brooch (stolen item)
It's in the Orchestra Pit.
Remember the rules: no two suspects (nor the item) ever share a row or a column, each character is in a different room, and the thief is the only one sharing a room with the stolen item. Unsure? Read how to play and the clue types.
Solution
Try it yourself first: pen and paper are enough. When you want to check, open the reasoned solution.
Show the step-by-step solution
- Martha's clue: She's 6 columns away from the Props Room. 2 cells remain possible: H9 and G10.
- Sven's clue: He's right next to the Dressing Room. 9 cells remain possible.
- Priya's clue: She's 2 rows away from the Props Room. 2 cells remain possible: A7 and B7.
- Xiomara's clue: She's in column D. 8 cells remain possible.
- Noah's clue: He's in row 6. 10 cells remain possible.
- Grace's clue: She's in the Dressing Room. 5 cells remain possible: I2, J2, I3, J3 and I4.
- Dana's clue: She's in the Café. 5 cells remain possible: D3, D4, D5, E5 and D6.
- Yusuf's clue: He's 1 row away from the Dressing Room. It leaves a single cell: I1.
- The stolen item's clue: It's in the Orchestra Pit. 8 cells remain possible.
- Yusuf can only be on I1. No one else can be in row 1 or column I, and no other character can be in the Stage.
- Every cell still open to Priya is in row 7, so no one else can be in that row.
- Every cell still open to Priya is in the Lobby, so no other character can be there.
- Every cell still open to Xiomara is in column D, so no one else can be in that column.
- D3, D4, D5 and D6 have already been ruled out, so Dana can only be on E5. No one else can be in row 5 or column E, and no other character can be in the Café.
- Every cell still open to Noah is in row 6, so no one else can be in that row.
- Every cell still open to Grace is in column J, so no one else can be in that column.
- I1, H2, I2, J2, H3, I3, J3 and I4 have already been ruled out, so Sven can only be on H4. No one else can be in row 4 or column H, and no other character can be in the Rehearsal Room.
- H9 has already been ruled out, so Martha can only be on G10. No one else can be in row 10 or column G, and no other character can be in the Makeup Room.
- D3, D4, D5, D6, D7, D9 and D10 have already been ruled out, so Xiomara can only be on D8.
- B4, C4, A5, B5, C5, B6 and C6 have already been ruled out, so the Ruby Brooch can only be on C3. No one else can be in row 3 or column C.
- I2, I3, J3 and I4 have already been ruled out, so Grace can only be on J2.
- The Ruby Brooch can only be in the Orchestra Pit, and Noah is the only character who can still get in there. Since the thief shares a room with the item, Noah must be in the Orchestra Pit.
- Every other cell the clue allowed has already been ruled out, so Noah can only be on B6. No one else can be in row 6 or column B, and no other character can be in the Orchestra Pit.
- B7 has already been ruled out, so Priya can only be on A7.
Conclusion: Noah is the only person sharing the Orchestra Pit with the Ruby Brooch, which is on C3. He is the thief.