Hmm.. interesting.. Played with a bit, and found that this works: 
my %data=map {
    +"Player number $_", [ map { 1 + int rand(10) } 1 .. 5 ] 
} 1 .. 10;

[download]
I'm can't explain why, but hopefully someone will help clarify.. must be related to evaluation order or something like that.

Two side comments .. This does (nearly) the same thing: 
my %data=map {
  $_  => [ map { 1 + int rand(10) } 1 .. 5 ]
} 1 .. 10;

[download]
First change is using => instead of a comma -- this makes it more obvious to the reader that you're constructing key-value pairs. Second is just making the key be the player number -- this might be useful to you later in the code, and then you can include the text "Player number" only when you're actually print'ing out the data later.

In reply to Re: syntax error with map in list context by davidrw
in thread syntax error with map in list context by LucaPette

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.