Single-Cell Cage
Beginner Places a digit Used in: Calcudoku
A cage made of a single cell has nothing to combine with, so its clue fixes the cell’s value outright. Spotting these first gives you free anchors to build the rest of the solve around.
How to spot it
A cage made of a single cell.
What you can conclude
Its clue is the cell’s value — place it directly.
Worked example
A one-cell cage clued 3 simply holds a 3.