Tap tiles to select (up to 2). Tile “1” is first selected. V-Stack puts Tile 1 on top; H-Stack puts Tile 1 on the left. Long-press and drag to reorder. Cart toggles a real cartouche shape inside the selected tile (it stays even when you add more tiles). Joins are blocked if the merged tile would exceed the screen width.

Too wide to fit on screen

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