Fire Emblem - Shadow Dragon - Platform: Nintendo DS

Gaiden chapters:
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Successfully complete the indicated task to unlock the corresponding Gaiden 
chapter:

Chapter 6x: Have less than fifteen characters at the end of Chapter 6 
Chapter 12x: Have less than fifteen characters at the end of Chapter 12. 
Chapter 17x: Have less than fifteen characters at the end of Chapter 17. 
Chapter 20x: Have less than fifteen characters at the end of Chapter 20 
Chapter 24x: Have Chiki dead and no falchion. 

Units:
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Successfully complete the indicated task to unlock the corresponding unit:

Alan (Paladin): In Chapter 16, visit the village to the left with Marth.
Note: You cannot recruit Samson after recruiting Alan. 
Astria (Hero): In Chapter 13, talk with Midia. Note: Appears as an enemy. 
Athena (Myrmidon): In Chapter 6x, visit the village with Marth. 
Banutu (Mamkute): In Chapter 7, visit the village with Marth. 
Beck (Shooter): In Chapter 13, visit the village with Marth. 
Chainy (Commando): In Chapter 16, talk with Marth. Note: Appears as an enemy. 
Chiki (Mamkute): In Chapter 19, talk with Banutu. Note: Appears as an enemy. 
Daros (Pirate): In Chapter 2, talk with Marth. Note: Appears as an enemy. 
Ellis (Cleric): Unlocked automatically in Chapter 24. 
Est (Pegasus Knight): In Chapter 18, talk with Marth. Note: Appears as an enemy.
Etzel (Sorcerer): Successfully complete Chapter 17x without killing him. 
George (Sniper): In Chapter 9, Visit the village with Marth. 
Gordon (Archer): In the last part of the tutorial, talk with Marth. Note: 
Appears as an enemy. Also automatically unlocked at start in Hard mode. 
Horus (General): Successfully complete Chapter 12x without killing him. 
Hymir (Warrior): In Chapter 20x, talk with Marth and complete the chapter. 
Jake (Shooter): In Chapter 11, talk with Sheeda. You must also visit the 
village where Anna is in the same chapter. Note: Appears as an enemy. 
Kashim (Hunter): In Chapter 2, talk with Sheeda. Note: Appears as an enemy. 
Linda (Mage): In Chapter 11, visit the village with Marth. 
Machis (Cavalier): In Chapter 4, talk with Rena. Note: Appears as an enemy. 
Maria (Cleric): In Chapter 10, talk with Marth. Note: Appears as an enemy. 
Marich (Mage): In Chapter 4, visit the northern village with Marth. 
Minerva (Dragon Knight): In Chapter 10, talk with Marth after already 
recruited Maria. Note: Appears as an enemy. 
Nagi (Mamkute): Successfully complete Chapter 24x. 
Navarre (Myrmidon): In Chapter 3, talk with Sheed. Note: Appears as an enemy. 
Riff (Priest): In Chapter 1, visit the western village with Marth. 
Roger (Knight): In Chapter 8, talk with Sheeda. Note: Appears as an enemy. 
Samson (Hero): In Chapter 16, visit the village to the right with Marth. Note: 
You cannot recruit Alan after recruiting Samson.