The craze in Finland at the time was for physics games, in which the action in a game replicates the force and mass of the physical world instead of cartoonish explosions and speeds.
As game worlds become more complex, with more items and more elaborate possibilities, there is more need for a physics model to determine how items in the game world behave, he says.
The same physics-based game mechanics are at play in Bad Piggies that made both Cut the Rope and Angry Birds so popular, and they're just as fun in this time around.