Hi, you don't need the Enter button bar to enter the data. Use

my $input = $mw->Entry (-text => "",)->form;
$input->focus;
$input->bind('<Return>', \&enter);
[download]

that will put the cursor right into the entry widget, so the player can start typing numbers, followed by the Enter key to play the number.

To clear the last number out, put this at the end of your sub enter:

sub enter{
   ......
   .....
  $input->delete(0,'end');
}
[download]