This is an old favorite for me.
I like minesweeper :)
Works
ALMOST perfect. Great rendition with the look and feel you expect. Ads are not too bad, and I'd pay for the ad-free version except the one thing I miss is the "possible mine" (?) tile, where you can label what MIGHT be a mine, making it easier to track what is going on. So far, none of the other Minesweeper games I've looked at have that option from the original; if I could find one as good as Minesweeper for Android that also had the "possible mine" (?) option, I'd pay for that in a heartbeat.
Fun and hard
Solid
Works great!
Enjoyable
Way too many scenarios where you have to take a random guess, the original Minesweeper let's program to avoid such scenarios
I love minesweeper there are ads but it isnt unbearable (just quick 'close' ads really)