ALIBRIX DETECTIVE PUZZLES CASE FILE #001
The Missing Prize · free murder mystery

The giveaway is over. The case remains open.

You can still investigate The Missing Prize for free. Try it yourself first, then compare your conclusion with the official solution below the case.

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  • About 15 minutes
  • Interactive work grid
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BEGINNER 3 SUSPECTS · 2 MARKERS ± 15 MIN SOLUTION INCLUDED
00

Free murder case

Crack the case at your own pace

1Study the clues, rooms and fixed traces.
2Place all five elements in the interactive grid.
3Determine the culprit, crime scene and decisive evidence.

Want to solve it yourself? Do not scroll to the official solution until you have written down your conclusion.

New to ALIBRIX? View the four main investigation rules first.
BOOKS & STUDY ALIBI FILE

CASE 01

The Missing Prize

After the ALIBRIX final at Raven House, competition director Cas van Rijn was found dead in the central hall. The golden duo prize was missing and the body had been moved. Place the suspects and markers, then combine location, traces and time to determine who, where and which evidence.

ALIBRIX-ELEMENTEN

3 suspects · 2 markers
A Veerle20.42–20.54
B Milo20.18–20.34
C Noor20.48–21.02
M1 Location indexINVESTIGATION MARKER
M2 Forensic pointINVESTIGATION MARKER

ALIBIMATRIX

place all 5 elements first
ACCESS LOGA

Veerle’s pass was registered in the square containing the tall plant.

ROUTE REPORTB

Milo’s route ended in a square containing a document case.

WITNESS STATEMENTC

Noor was two rows south and one column west of M2.

LOCATION SCANM1

The location index was left in a square containing a standing lamp.

FORENSIC INDEXM2

The forensic measuring point was set up in a square containing a wall clock.

ALIBICHECK

combine after placement
AUTOPSY REPORT

Death occurred between 20:44 and 20:50. Only suspects whose alibi overlaps this interval remain relevant.

LOCATION EXAMINATION

The crime scene was in the same zone as M1. That zone touches the outside edge, has one window and one visible door.

FORENSIC MATRIX

The decisive evidence lies one row north and one column west of M2.

ALIBRIX ANALYSIS

The culprit was at least three matrix steps from the decisive evidence and their alibi overlaps the autopsy interval.

ONE ALIBRIX ELEMENT PER ROW AND COLUMN · FIXED TRACES DO NOT COUNT

LOCATION & TRACES

the prize wing

5×5  3 SUSPECTS · 2 MARKERS
BEGINNER ●○○○ A five-by-five floor plan with three zones and fixed traces Rows R1 to R5 and columns K1 to K5. Most squares are empty; several objects recur and must be combined with the row and column rule. K1K2K3K4K5 R1R2R3R4R5 TROPHY ROOMARCHIVECONSERVATORY CAMERAPRIZE CATALOGUETROPHYWALL CLOCK

NOTES MATRIX

5×5 · empty work grid

Select an element and tap the square where you want to place it. An element can occur only once.

K1K2K3K4K5 R1 R2 R3 R4 R5

FINAL DEDUCTION

Record possible positions and exclusions, then draw your final conclusion.

ONE SUSPECT OR MARKER PER ROW
CULPRIT · CRIME SCENE · EVIDENCEReady? View the official solution ↓
FILE UNSEALED · OFFICIAL SOLUTION

This is how The Missing Prize was solved

The evidence locker is closed. Now follow the trail from the first fixed positions to the only conclusion that fits every clue.

01 · CULPRIT C
THE CULPRIT ISNoor
02 · CRIME SCENE
IT HAPPENED IN THEConservatory
03 · EVIDENCE
THE DECISIVE TRACESilver thread
PLACEMENT CHECK The completed ALIBI matrix
Cculprit M1marker ✦silver thread
THE DECISIVE CHAIN

Five deductions, one possible outcome

  1. 1

    The pictured objects fix A at R1K1, B at R3K5, M1 at R5K4 and M2 at R2K3.

  2. 2

    C is two rows south and one column west of M2. Therefore C must be at R4K2.

  3. 3

    One row north and one column west of M2 is R1K2. The fixed trace there is the silver thread.

  4. 4

    M1 is at R5K4, in the zone that touches the outer edge and has one window and one visible door: the Conservatory.

  5. 5

    Milo's alibi does not overlap 20:44–20:50. Veerle is only one matrix step from the evidence. Noor overlaps the time window and is exactly three steps away — the only suspect who meets both conditions.

FINAL CONCLUSION Noor committed the murder in the Conservatory. The silver thread gave her away.
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