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Grand Slam: World Class Tennis (Mac OS Classic)

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Title Screen

Grand Slam: World Class Tennis

Developers: MacroMind, Infinity Software
Publisher: Infinity Software
Platform: Mac OS Classic
Released in US: 1986

DevTextIcon.png This game has hidden development-related text.
GraphicsIcon.png This game has unused graphics.

When I say this hit tennis sim had input from a former pro player, what are you thinking? A photo shoot and a back-of-the-box blurb?

Because he actually bought the unfinished game off its developers, hired a new team to complete it to his specifications, and founded his own company to publish it: a gamble that extended to quitting his job and going $30,000 into debt.

That is what I call input.

Early Opponent Names

The four opponents by ascending difficulty are Ace, Chiphead, Warrior, and Demon, but the data files for the first three are called Smith, Jones, and Sleezak. (The name Sleezak does appear in-game as filler on the tournament bracket.)


Going by these sprites, the umpire could have had the ability to turn his head in either direction (also, less and/or darker hair).

Grand Slam WCT (Mac OS Classic) - Umpire right.png Grand Slam WCT (Mac OS Classic) - Umpire left.png

MacPaint Documents

Each tennis court backdrop has a few pixels' worth of unseen detail past the right edge of the screen, followed by barcode-like stripes.

Grand Slam WCT (Mac OS Classic) - Wimbledon.png

On top of that, the gray texture used in the Australian backdrop floods well out of bounds:

Grand Slam WCT (Mac OS Classic) - Australia.png

In the blank space below it are two sprites of the ball boy; the one on the left is an unused variant with a different face.

Unused Used
Grand Slam WCT (Mac OS Classic) - Ball Boy unused.png Grand Slam WCT (Mac OS Classic) - Ball Boy used.png

Misc Strings

The CANV owner resource contains a build date for version 1.0, even in version 1.1:

Grand Slam Version 1.0  May 1986

STR# resources 550 and 650 both say:

DEBUG: Maybe Later.