Batman Patch The Pixels
For instance, some of the missing tiles are Batman's mask, a piece of crusader's cape, Robin's boot, famous Batman's batarang sign etc. The problem is that the tiles, while sitting on the palette, are not displayed in the original size and even the shape looks somewhat deformed. But once you start to drag it, the shape turns back to normal.
In the pictures below you can see the solutions to the puzzles number 2 and 3. Once you solve all three puzzles, the game is finished ('more games' button doesn't work).