But as the score increases, so
does the speed at which the blocks fall. The system is
balanced so that the di?¬? culty increases automatically
as the player??™s ability increases. In this case, di?¬? culty is
directly related to the variable of speed.
10.12 Balancing for the median skill level 10.13 Tetris for Game Boy
296 Chapter 10: Functionality, Completeness, and Balance
Single player racing games such as Gran Turismo 3,
Project Gotham Racing, and Mario Kart 64 have a selfbalancing
mechanism. In these games, when a race
starts, the computer opponents (i.e., the other cars)
accelerate up to their maximum speed. This speed is
slightly slower than the maximum speed achievable
by a human player if she drives perfectly. The computer
opponents remain at maximum speed as long
as the human is close or leading the race, meaning the
pack will be tight. When the human crashes her car,
the rules for the computer opponents change. They
slow down to a reduced speed so that the human can
catch up.
When the human player closes in on the computer
opponents, they accelerate back to their maximum
speed.
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