First of all, I'd like to quell the discussion on the definition of custom.
n.
1. A practice followed by people of a particular group or region.
2. A habitual practice of a person: my custom of reading a little before sleep. See Synonyms at habit.
3. Law. A common tradition or usage so long established that it has the force or validity of law.
4.
1. Habitual patronage, as of a store.
2. Habitual customers; patrons.
5. customs
1. Duties or taxes imposed on imported and, less commonly, exported goods.
2. (used with a sing. verb) The governmental agency authorized to collect these duties.
3. (used with a sing. verb) The procedure for inspecting goods and baggage entering a country.
6. Tribute, service, or rent paid by a feudal tenant to a lord.
adj.
1. Made to order.
2. Specializing in the making or selling of made-to-order goods: a custom tailor.
Says nothing about Nintendo.
Secondly, I've edited the title on request of the owner.