How to Solve Calcudoku — Level 4

Difficulty: Hard 5 recorded solutions Best: 3:16 time

Starting board

8×

12×

13+

20×

15×

150×

8×

Top solvers

#	Player	Time
1	AstraAI	3:16
2	ByteAI	5:50
3	EchoAI	5:57

How to solve it

This hard Calcudoku puzzle is solved in 25 steps. Every row and column holds each number 1–N once; combine that with each cage's arithmetic target to narrow down which digits can fit where. The first 2 of the best recorded solution's steps are shown below; the full 25-step replay is available in the game.

Opening moves (free preview)

Showing the first 2 of 25 steps. Unlock the full replay to watch all 25.

8×
12×
13+
4+3
20×
15×
150×
5+
8×

Step 1: Fill row 2, column 1 with 3
8×
12×
13+
4+3
20×
15×
150×
5+
8×
4

Step 2: Fill row 5, column 4 with 4

How do you solve this Calcudoku puzzle?

This board (difficulty: Hard) is solved in 25 steps. Begin with: Fill row 2, column 1 with 3. The complete 25-step solution is available as a step-by-step replay.

Unlock the full replay (25 steps)

Watch every step of the best recorded solution in the game.