Rovio has soft-launched Angry Birds Under Pigstruction on the Canadian App Store.

It's yet another "slingshot strategy" game in the series but it comes with a few additions to the formula.

In Under Pigstruction, you pick which bird you'd like to fling rather than being given them in a specific order. They each have special powers and are effective against certain materials.

There are also spells that you can use, with the first one having the level rain with rubber ducks. There are also blizzards, chilis, and many more.

However, the biggest addition is that some levels are multi-stage. This alludes to the games "Under Pigstruction" title as the piggies will build the levels to defend themselves.

There are also boss fights that have you using the environment to deplete the boss's health bar. There's a Foreman Pig, Chef Pig, King Pig, and many more.

The current version of Under Pigstruction has 270 levels. There's also an Arena to unlock where you can compete in tournaments against other players.

You can download Angry Birds Under Pigstruction for free on the Canadian App Store right now. It should be released globally later this year.