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It was Mauritania. But I also zoomed in after like half of them so that's kinda cheating.

I did that too, after 10 pieces (Mauritania was one of the hardest).

Meh, if the map supports zooming, I don't consider it cheating. I didn't even try to zoom, but I'd have used zoom had I been aware. Now the guy above that looked at the page source-- he's cheating. ;-)

haha, i had a different piece that was difficult - it was the saudi arabia piece. That took me forever to see.

I had a hard time finding Ukraine, Thailand was also slightly hard to place pixel-perfect !

Took me a couple tries to get Thailand, too, as it didn't snap to the map the first time I placed it.

A version with all countries would be an interesting teaching tool, to learn about geography and cartography. Would need to option to display only some countries at a time, to avoid overwhelming the user.

Stuck on not finding S. Africa

South Africa was hard, but the hole for Lesotho was the big tip off for me.

Mauritania ;)