|An early, but difficult, level|
And again, for that one remaining person, the concept is simple, but addictive. You "fire" birds from a catapult (these birds don't fly, they fall with style) to knock over and blow up structures, in order to explode the pigs. (What do you mean, "why"?)
The physics engine means that if you hit things just right, they fall in glorious cascades, squashing everything in sight. If you don't, they fall in the wrong place, or wobble, or tilt, and you have to try again. And again. And again. Hence the four hours.
Different kinds of birds have different capabilities, and you get only a limited number, so you have to plan carefully. And then you have to execute the plan, which involves a combination of skill and luck (that's the way the castle crumbles).
It took me back a couple of decades, to Lemmings, which absorbed a lot of life back then (I really should know better by now).
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Time has moved on since the relatively simple graphics and trivial dynamics of Lemmings. Angry Birds has that physics engine which gives a whole new level of realism (although I do think the friction model is a bit too sticky). But Lemmings had its own great feature: insanely compelling use of background music. To this day, whenever I hear a certain piece of Mozart, I flash back to images of hordes of grimly marching lemmings.
Now, have I got time for just one more go before lunch?