With a Japanese Sony PlayStation Network Card, you can purchase original PlayStation games, Sony PlayStation Portable (PSP) games, and other online content from the Sony Japan store. In other words, you can play classic games in Japanese on your US or European PS3 or PSP, having fun and learning at the same time.

You can open a Japanese account for free on a US or European PS3. Learn how to register for a free Sony Japan account.

Unfortunately, the Japanese store does not accept US or European credit cards, and only residents of Japan are allowed to apply for Japanese credit cards. This is where NihongoPeraPera can help- by purchasing a card on this site, you will receive the code by e-mail within 24 hours. Get up and running quickly and support NihongoPeraPera at the same time!

What games are available?

See my recommendations (including thoughts on the language ability required).

Wikipedia has the full list.