The scene
Logic Workshop · Prize lockersThe prize was hidden in a locker whose code appears in the bottom row of a grid. Several digits have been erased.
Every row and column must contain the numbers one, two and three once each. The remaining digits let you reconstruct the grid.
What we know for certain
One of these people put the prize in their own locker. The valid grid determines its code exactly. No visible digit was altered. Nobody lent out keys, rotated the grid or reflected it.
The three accounts
Fina Costa
Activity leader«My locker uses the code 123.»
Gael Sol
Student«Mine has the code 312.»
Hana Puig
Designer«I have locker 231.»
Examine the evidence
0 of 5 openedOpening these five clues does not cost points.
01The top row
The first row contains 1, 2, 3 from left to right. All three digits are visible and correct.
02The middle row
Only its first digit remains: 2. Its second and third positions have been erased.
03The bottom row
All three of its digits have been erased. Recover them using the same rules as for the other rows.
04The complete rule
Every row and column contains 1, 2 and 3 exactly once. There are no special diagonals or extra numbers.
05Reading the code
Read the code along the bottom row from left to right. The assigned lockers are Fina 123, Gael 312 and Hana 231.