The wikipedia article indeed does mention those facts. But, it also mentions that there are other variants of the game. The version of the game I have at home has no such restrictions. This Perl code is based on the game manufactured by Hasbro (formerly Milton Bradley) in the United States in 1999. Your post has prompted me to do a little more web searching to find a site
more specific to this version, including the rules
. I apologize for the confusion.
That being said, the variant you pointed out is slightly more complex, and hence, would make for more interesting analysis.