What is Naked Triple? How to Solve Sudoku

What it is

Like a Naked Pair, but with three cells. Together, the three cells' candidates make exactly three digits (say 1, 4, 7).

Those three digits are used up by the three cells, so remove 1, 4, and 7 from the rest of the group.

Each cell can hold just two of them, like 1/4, 4/7, and 1/7.

How to spot it

When a group has three cells with two or three candidates, check whether together they use only three digits.

Example

Yellow cells are where to look, orange cells are the reason, red digits are candidates you can remove, and the blue digit is the answer.

In column 2, R3C2, R4C2, and R7C2 can only hold 2, 3, and 4. That's 3 cells for 3 digits, so 2, 3, and 4 are used up here (even if we don't know which goes where yet). So the other cells of column 2 (R1C2, R5C2, R8C2, and R9C2) can't be 2, 3, and 4.