Roboku
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Case 47: who took the Giant Pearl?
During the night rounds at the aquarium, a guard raised the alarm: the Giant Pearl, which should be in the Gift Shop, is missing. Everything points to the thief still being among those present. Help the police unmask them.
The board
- 1Maintenance Room
- 2Gift Shop
- 3Diving Room
- 4Café
- 5Reception Area
- 6Laboratory
- 7Office
- 8Restrooms
- 9Terrace
- 10Tank Room
- 11Lobby
- 12Main Aquarium
- 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.
- Window: the blue line on a wall.
Suspects and clues
- IInes
She's next to a window. - EEsteban
He's 8 rows away from the Maintenance Room. - XXiomara
She's in column J. - CChidi
He's 6 columns away from the Café and right next to the Laboratory. - AAmara
She's 3 columns away from the Main Aquarium. - SSandra
She's 6 columns away from the Maintenance Room. - TTariq
He's 3 columns away from the Terrace. - MMatthew
He's in row 1. - GGiant Pearl (stolen item)
It's 1 column away from the Laboratory.
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
- Ines's clue: She's next to a window. 8 cells remain possible.
- Esteban's clue: He's 8 rows away from the Maintenance Room. 2 cells remain possible: B1 and D3.
- Xiomara's clue: She's in column J. 7 cells remain possible.
- Chidi's clue: He's 6 columns away from the Café and right next to the Laboratory. It leaves a single cell: A6.
- Amara's clue: She's 3 columns away from the Main Aquarium. It leaves a single cell: B11.
- Sandra's clue: She's 6 columns away from the Maintenance Room. 3 cells remain possible: H9, I10 and J11.
- Tariq's clue: He's 3 columns away from the Terrace. 2 cells remain possible: G6 and E8.
- Matthew's clue: He's in row 1. 5 cells remain possible: B1, F1, G1, J1 and K1.
- The stolen item's clue: It's 1 column away from the Laboratory. 3 cells remain possible: D3, E4 and F5.
- Chidi can only be on A6. No one else can be in row 6 or column A, and no other character can be in the Terrace.
- Amara can only be on B11. No one else can be in row 11 or column B, and no other character can be in the Maintenance Room.
- B1 has already been ruled out, so Esteban can only be on D3. No one else can be in row 3 or column D, and no other character can be in the Restrooms.
- G6 has already been ruled out, so Tariq can only be on E8. No one else can be in row 8 or column E, and no other character can be in the Reception Area.
- D3 and E4 have already been ruled out, so the Giant Pearl can only be on F5.
- Every cell still open to Xiomara is in column J, so no one else can be in that column.
- B1, F1, G1 and J1 have already been ruled out, so Matthew can only be on K1. No one else can be in row 1 or column K, and no other character can be in the Tank Room.
- K1, D2, A3, A7, A9, J9 and K10 have already been ruled out, so Ines can only be on I4. No one else can be in row 4 or column I, and no other character can be in the Lobby.
- I10 and J11 have already been ruled out, so Sandra can only be on H9. No one else can be in row 9 or column H, and no other character can be in the Office.
- J1, J2, J3, J4, J9 and J11 have already been ruled out, so Xiomara can only be on J10.
Conclusion: Ines is the only person sharing the Lobby with the Giant Pearl, which is on F5. She is the thief.