Fire Emblem: The Sacred Stones Tips

Duplicate Units (cheat codes required)
Once you have completed the game, and you are in map mode it is possible to get other characters by completing the tower and the ruins. After you get one of these characters, change who they are using a cheat device, and save. The next time you go back into the tower or the ruins, you will receive the message telling you that you can now use that same character that you just changed. You can keep doing this to gain more units for battle or just some extra characters to use with your cheat device.