Sonic Chronicles - The Dark Brotherhood - Platform: Nintendo DS

Completion bonus:
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Successfully complete the game to unlock the New Game Plus mode.


Bonus characters:
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Successfully complete the indicated task to unlock the corresponding character:

Cream: Get Knuckles on your team, then go to Cream at the center of Green Hill 
Zone. Find Cheese in the tower to the southeast, and Cream will join your team.
E-123 Omega: Successfully complete the side quest in the northeast of 
Metropoplis. Ascend to the top, and have Tails fly to the west. E-123 Omega 
will be in an underground room.


Easily complete Kron Colony:
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Defeat the first Kron you encounter. Save the game, then go south to an opening. 
You must fight another Kron. After you defeat him, with Amy in your team, go to 
the opening west from that area. Once you enter, bash the boxes with Amy's 
hammer. Go forward, and ignore the Kron. If you get attacked by him, just flee. 
Go to the next room. Continue until you reach the ruler, then talk to him.


Sega Genesis reference:
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Fly to the top of the building that is at the bottom-left of the map in 
Metropolis. Fight (or flee from) the Seeker Drone, then continue to find a Sega 
Genesis. There is a controller beside the machine next to the Genesis.