This works for me:

use strict;


my %db = (
   'scores' => {
                'user1' => 200,
                'user2' => 190,
                'user3' => 232,
                'user4' => 187,
                'user5' => 190
               }
);



my %sorted_scores;

#
# Generate another hash structure where
# scores are used for keys and values
# hold list of users who got that score.
#
# hash is a wonderful thing ;-)
#
for (keys %{$db{'scores'}}) {
    push @{$sorted_scores{$db{'scores'}{$_}}}, $_;
}

my $i = 1;
for my $score (sort {$b <=> $a} keys %sorted_scores) {
    print "$i Place: ";
    for (@{$sorted_scores{$score}}) {
        print "$_ ($score), ";
    }
    print "\n";
    $i++;
}
[download]

This code produces the following output:

1 Place: user3 (232),
2 Place: user1 (200),
3 Place: user2 (190), user5 (190),
4 Place: user4 (187),
[download]

The only remaining part is to remove excessive commas and also print numbers in a slightly different format... (adding 'st' to 1 and 'nd' to 2 etc.)

Cheers, vladb.

"There is no system but GNU, and Linux is one of its kernels." -- Confession of Faith