The following are known Action Replay Codes for Overlord Minions on Nintendo DS (NDS).

Game ID: CIUE-03E5A0F6

Spawn Count Always 0
62121b80 00000000
b2121b80 00000000
20000013 00000000
d2000000 00000000

Time Always 00:00
62121b80 00000000
b2121b80 00000000
00000014 00000000
d2000000 00000000

Always 99 Treasures Collected
62121b80 00000000
b2121b80 00000000
20000011 00000063
d2000000 00000000

PRESS SELECT TO ACTIVATE CODES:

Unlock All Withering Woods Stages
94000130 fffb0000
221221a6 00000007
d2000000 00000000

Unlock All Briarthorn Burrows Stages
94000130 fffb0000
221221a7 0000000f
d2000000 00000000

Unlock All Cloudland Keep Stages
94000130 fffb0000
221221a8 0000000f
d2000000 00000000

Unlock All Fossilized Temple Stages
94000130 fffb0000
221221a9 0000000f
d2000000 00000000

Unlock All Floating Fortress Stages
94000130 fffb0000
221221aa 0000000f
d2000000 00000000

Unlock All Dragonspire Stages
94000130 fffb0000
221221ab 0000000f
d2000000 00000000