Sixteen
There is no empty slot here. An entire row or column slides at once and wraps around as you rebuild the number sequence.

How to play
Click an edge arrow to shift a line of numbers one space. The last tile wraps around. Put the numbers in reading order starting in the upper-left corner.
Playing tip. A shift moves the whole line and wraps its end tile around. Track one target tile before you try to fix a full row.
Read the game instructions ↗Game by / provided by Simon Tatham’s Portable Puzzle Collection ↗ · License
Player corner
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