There is a fun series of free geography puzzle games called Enjoy Learning that I find simple, stable, and addictive. I tried the two apps most relevant to me: Enjoy Learning World Map Puzzle, and Enjoy Learning US Map Puzzle. Each game is based on the same premise: locate states, regions, and countries and slide the cut outs on to the map. Each map starts blank and you drag and drop pieces of fill in the puzzle.
There are different levels of difficultly which would be great for differentiating among students. Also, every game is timed, so there is significant replay value as you try to beat your (and other students’) best scores. That repetition would be great for reinforcing student learning.
I could see using this as a short transition activity, game break, or maybe even a reward activity. With a small group, I could imagine developing a larger competitive game around the puzzle.
There is some banner advertising at the bottom of the menu pages, but not the game, which is much less intrusive than so many free games. I recommend these apps for any age group in school, or even for adults just to pass a few minutes doing a brain activity. Without hints on large world maps, the puzzle can be quite challenging.
Enjoy Learning World Map Puzzle (Free) Minimal advertising
Enjoy Learning US Map Puzzle (Free) Minimal advertising