The options presented so far are all rather good. I know that using the
same pins for different things can be a bit intimidating, so allow me to
offer another idea. Serial shift registers. You could use a serial to
parallel to light your displays, then a parallel to serial to read your
switches. More components and thus a higher cost, however you are less
dependent on time.

Josh
--
A common mistake that people make when trying to design something
completely foolproof is to underestimate the ingenuity of complete
fools.
        -Douglas Adams

Vlad wrote:
> I'm in the process of designing a toy circuit to keep track of life
> counters for various games.  It should support 3 players.  Each player
> will have two 7 segment LED displays that will display a number between
> 0-99, and also 2 switch buttons that will be used to increase and
> decrease the number displayed on these LED displays.

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