One rule. Many little gardens.
Fill every empty square with 1, 2, 3 or 4. Squares with the same number that share an edge form one patch.
A patch of 3 must contain exactly three 3s. The same goes for 1, 2 and 4. Patches can bend; corners do not connect.
Two patches of the same number cannot share an edge — they would become one oversized patch. Printed clues never change.
Tap a cell, then a number. Keyboard: arrow keys to move, 1–4 to write, Backspace to erase, Z to undo, H for a logical hint.
Show a tiny example
221333
A pair of 2s, one lone 1, and three connected 3s. Every number counts its own patch.