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Try AddEoki

Drag each number into the grid — you'll find out if you're right once every cell is filled.

Easy
Medium
Hard
Challenging
Genius
Beyond Genius

Fill every cell so each number is used exactly twice, no identical numbers touch horizontally or vertically, and every row and column adds up to the same total. Drag a number from the tray below onto an empty cell — drag a placed number back to the tray, or onto another cell, to move it.

This puzzle's numbers
Drag these into the grid
AddEoki in short: a 4×4 grid, eight numbers, each used twice, no adjacent duplicates, and every row and column sharing one equal total.