Rovio’s smash hit game Angry Birds has finally landed on Facebook, becoming available on the world’s biggest social network with a number of unique features one day before Valentine’s Day, when it was officially scheduled to launch.

The Flash-based game debuts on Facebook with a selection of in-game options that make it easier for players, effectively allowing them to cheat and bypass more difficult levels by shaking the game screen or selectively targeting a pig.

Rovio describes the power-ups:

Power-ups are unique to Angry Birds on Facebook. There are 4 different types of power-ups and they can be accessed via the lightning bolt button at the top of the screen. You can use two power-ups per level. The four power ups are: Super Seeds, King Sling, Sling Scope and Birdquake. All power-ups have a different effect but ultimately make you more competitive against your friends by making your birds stronger or more accurate or even by shaking the earth itself!

Screen Shot 2012 02 13 at 14.14.20 520x352 Angry Birds crashes onto Facebook a day early, available to play now

The Super Seeds “increase the size of the bird that is currently in the slingshot. This directly increases the amount of damage the bird does,” the King Sling boosts the “initial launch speed of all your birds” and “directly increases the amount of damage all your birds do and changes their flight trajectory.”

The Sling Scope “allows you to see a large part of a bird’s trajectory before launch” and “affects all your birds”, and finally the Birdquake “shakes the ground in any level. It is best used for nudging pigs off of ledges and bringing unstable buildings crumbling to the ground.”

Being tied to Facebook, it also allows users to select from a small number of friends and challenge them to beat their high score within the app. Players can also gift power-ups to their friends via the Mystery Gift option, which is limited to one per friend each day.

Rovio says you can also receive power-ups through daily rewards for visiting Angry Birds on Facebook on consecutive days or by purchasing via the shop, which can be found in the bottom right corner of the screen.

The game is exactly the same as you will remember but launches with a few added extras. Rovio believes there is still life left in the franchise and has worked to monetize it on the world’s biggest social networking website.

You can play it now by clicking this link.

Screen Shot 2012 02 13 at 14.14.20 520x352 Angry Birds crashes onto Facebook a day early, available to play now