The Grim Adventures Of Billy And Mandy

Concept art:
Successfully complete the game.

Tier 2 Missions:
Collect 8 Mojo balls in Mission mode.

Tier 3 Missions:
Collect 17 Mojo balls in Mission mode.

Tier 4 Missions:
Collect 25 Mojo balls in Mission mode.

Tier 5 Missions:
Collect 35 Mojo balls in Mission mode.

Tier 6 Missions:
Collect 53 Mojo balls in Mission mode.

Play as Grim in Story mode:
Collect 15 Mojo balls and complete Mandy's storyline in Story mode.

Play as Mandy in Story mode:
Collect 5 Mojo balls and complete Billy's storyline in Story mode.