While I admit to being very new to Perl - I find default/pre-defined variables to be a source of constant inspiration. Using $_ $@ $| etc. can really confuse things.
Oh yeah - and overuse $_ - superfluously if possible - as an example from my first attempt I submitted today:
(_ is a sub that returns the input++) and now you can use any of the following - all to get 4:
game(Wookie,opponent) eq 'Wookie' ? undef $problem : remove_limbs(arms,opponent);
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