Fun game, but the frequency of the ads makes it not worth playing – LETTRO Challenges Review

Ads pop up at the beginning and end of every round. They seem timed to pop up so you accidentally tap them. It's so frustrating because the length of a round is very short. The time to finish a round is just as long as the time it takes to get back into the game after you've accidentally tapped an ad. The AI is also not very believable.
Review by nitrogenx on LETTRO Challenges.