PocketGamer writes: "What is it about number-based games? Recently, I had a great time with Big Top 10: in which you had to count up to ten for high scores. Now we have DropSum, a conversion of a popular web game where your goal is to create lines that add up to 9.
One less number doesn't mean there should be any less fun, though. Numerals aside, the gameplay between the two is completely different.
Instead of working off a filled grid of numbers, DropSum - as the name suggests - takes more a Tetris approach whereby numbers fall from the top of the screen."