Stone Blocks: Very durable, better for pushing than breaking (3 Coins).

Wood Blocks: Fairly sturdy but not hard to break (2 Coins).

Ice Blocks: Very weak, easily shattered (1 Coin).

Each character has a different weapon which determines how you tackle a level some must take out key blocks to cause a domino effect, some are better at hitting enemies directly, and some are just obliteration machines taking out anything even near the target. You can also hold-and-drag to fire in a spread (if the character's weapon isn't a single-shot blast), or press the 'Auto' button to let the computer do the targeting for you (though it isn't very efficient).

By tapping the screen, your character takes aim and fires their weapon. Once you select an available stage from the map of Piggie Island, your character runs along the foreground at a set speed, as block towers scroll by in the background. And, this being a 'freemium' game, there's lots and lots of other things to do and sub-systems to keep you busy.

The game is a bit of a deviation from the normal Angry Birds formula, but the core goal remains the same: toppling block towers to pop the Bad Piggies on them. The leader of the Flock (you know him well) heads out to free the Autobirds and Deceptihogs, for only by joining forces can they restore Piggy Island to normal!

Most of the Autobirds and all of the Deceptihogs are captured leaving only Red (who has the powers of Optimus Prime) free. The two sides briefly continue their struggle with these new powers until they are both threatened by another transformed group, the Eggbots, who seek to transform all of Piggy Island into metal, backed by countless robotized Minion Pigs. The ' EggSpark' has landed on Piggy Island, transforming its dueling inhabitants and giving them bodies and powers based on the Transformers: the birds of the Flock become Autobirds and the Bad Piggies the Deceptihogs.

Angry birds friends dec 29th