Instructions
Visit the Nintendo website's "General Comments or Questions" feedback form and complete the form, entering your email address, selecting a topic from the drop-down menu and typing a message. Click "Submit" to send your suggestion.
Write to Nintendo at 4820 150th Avenue Northeast, Redmond, WA 98052. This address is for Nintendo of America, so you may need a different address if you live outside the United States. Write your suggestions in the letter, addressing it to the appropriate department.
Call Nintendo Customer Service at 800-255-3700 and speak to the customer service representative about leaving a suggestion. You may be advised to contact a particular department, if necessary, and leave your message with them.