How to play Picture Sudoku

It is ordinary Sudoku, played with pictures instead of numbers. Fill the grid so every row, every column and every bold 3×3 box contains each of the nine pictures exactly once. No picture may repeat in a line or a box.

Tap a cell, then tap a picture from the tray to place it. Tap it again to clear it. Use Notes to pencil in the small candidate pictures while you work, and Erase to clear a cell.

The starting pictures are locked. Fill the whole grid correctly to reveal the cache. Each puzzle is generated fresh on the server, so the answer is never hidden in this page.