Flytrap writes: "By the beard of Zeus, a viral ad game that doesn't suck. Much. This one comes to you care of recently released action comedy Year One, a caveman road-trip starring Jack Black and Michael Cera which has "brain-dead frat boy favourite" written all over it in enthusiastic blue crayon.
Year One: Save the Princess springs from the elasticated loins of the how-far-can-you-go sub-genre, as typified by the illustrious Hedgehog Launch 2 and Learn to fly.
Somebody's stolen Jack Black's girlfriend. To rescue the said damsel, you must fire yourself across the intervening miles from your prehistoric cow-tapult (groan). Click-hold Jack and drag him back, and let go to take flight."