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Guide:
Step 1: Complete Levels 5, 10, 15, 20, and 25 (kill a black, purple/yellow, and gray character along the way)
Step 2: Complete Special Levels 3 and 6
Step 3: Die once if you haven't yet.
Step 4: Complete Level 1 with 3 stars if you didn't get 3 stars on any level above.
Guide:
Step 1: Complete Levels 5, 10, 15, 20, and 25 (kill a black, purple/yellow, and gray character along the way)
Step 2: Complete Special Levels 3 and 6
Step 3: Die once if you haven't yet.
Step 4: Complete Level 1 with 3 stars if you didn't get 3 stars on any level above.