Sekaiju no Meikyuu
This game is titled Etrian Odyssey in North America and Europe, and Sekaiju no Meikyuu in Japan.
Successfully complete the game to unlock the BGM option.
Register five new survialists and set all their skill points to Chop. Put them in your party. Enter the Labyrinth and go north twice, then east. Go though the shortcut. Note: The shortcut
must be activated form the other side before it is useable from this side. Next, go east, then north, and repeatedly press A until you reach your daily limit. After that, go back to town. Sell all the items and sleep until morning. Repeat this until you have as much money as needed.
Strategy guides from GameFAQs