We've launched a new iPad game recently in Canada called Zombie! Zombie! Zombie!
You create triangles by matching three identical zombies and survivors shoot everything in the triangle. It is a puzzle and strategy game where you have to meet certain objectives on each level of play, but as the zombies are constantly moving forward to eat your survivors, it has a real twitchy feel.
There are over 100 levels and tons of funny power-ups/special moves and boss battles.
Here's the App Store link: https://itunes.apple.com/ca/app/zombie!-zombie!-zombie!-hd/id578323099