You can unlock various sounds, illustrations, and 3D models to view in the Collection Menu by completing certain missions in Mission Mode. Note: Missions can be unlocked by progressing through the story, completing certain amounts of levels, acquiring play time, or with 5 Play Coins each.

Unlockable	How to unlock
10th Anniversary Figurine Picture	Clear Mission 58
15th Anniversary Figure Picture	Clear Mission 65
1991 Illustration	Clear Mission 2
1992 Illustration	Clear Mission 15
1993 Illustration	Clear Mission 22
1994 Illustration	Clear Mission 28
1995 Illustration	Clear Mission 34
1996 Illustration	Clear Mission 37
1997 Illustration	Clear Mission 39
1998 Illustration	Clear Mission 44
1999 Illustration	Clear Mission 47
2000 Illustration	Clear Mission 52
2001 Illustration	Clear Mission 56
2002 Illustration	Clear Mission 61
2003 Illustration	Clear Mission 92
2004 Illustration	Clear Mission 63
2005 Illustration	Clear Mission 67
2006 Illustration	Clear Mission 71
2007 Illustration	Clear Mission 94
2008 Illustration	Clear Mission 76
2009 Illustration	Clear Mission 96
2010 Ilustration	Clear Mission 82
20th Anniversary Figurine Picture	Clear Mission 88
A New Venture Music	Clear Mission 75
Amy 3D Model	Clear Mission 38
Angel Island Music	Clear Mission 31
Aquarium Park Act 1 Music	Clear Mission 79
Believe In Myself (Theme of Tails) Music	Clear Mission 41
Big Arm 3D Model	Clear Mission 97
Big The Cat 3D Model	Clear Mission 45
Biolizard 3D Model	Clear Mission 98
Blizzard Peaks Act 1/2 Mix Music	Clear Mission 72
Chaos Emeralds 3D Model	Clear Mission 51
Chemical Plant Music	Clear Mission 16
Cream and Cheese 3D Model	Clear Mission 77
Death Egg Music	Clear Mission 29
Diamond Dust Music	Clear Mission 43
Door Into The Summer Music	Clear Mission 36
Dr. Eggman 3D Model	Clear Mission 13
Egg Emperor 3D Model	Clear Mission 99
Emerald HIll Music	Clear Mission 14
Endless Possibility Music	Clear Mission 10
Flying Battery Music	Clear Mission 27
Free Music	Clear Mission 12
Green Hill Music	Clear Mission 1
High Flying Groove Music	Clear Mission 9
His World Music	Clear Mission 23
Hydro City Music	Clear Mission 33
Illustration 1	Clear Mission 19
Illustration 2	Clear Mission 30
Illustration 3	Clear Mission 73
Illustration 4	Clear Mission 4
Illustration 5	Clear Mission 8
Illustration 6	Clear Mission 81
Illustration 7	Clear Mission 84
Illustration 8	Clear Mission 86
Jeh Jeh Rocket Music	Clear Mission 68
Knight Of The Wind Music	Clear Mission 87
Knuckles 3D Model	Clear Mission 32
Leaf Forest Music	Clear Mission 49
Let The Speed Mend It Music	Clear Mission 85
Live and Learn Music	Clear Mission 53
Marble Garden Music	Clear Mission 35
Marble Zone Music	Clear Mission 3
Metal Sonic 3D Model	Clear Mission 25
Mushroom Hill Music	Clear Mission 26
My Sweet Passion (Theme of Amy) Music	Clear Mission 42
Neo Green Hill Music	Clear Mission 48
Omega 3D Model	Clear Mission 70
Open Your Heart Music	Clear Mission 40
Orbot and Cubot 3D Model	Clear Mission 83
Palmtree Panic Music	Clear Mission 60
Quick Trip To Paradise Music	Clear Mission 20
Race to Win Music	Clear Mission 21
Reach for the Stars Music	Clear Mission 78
Right There, Ride On Music	Clear Mission 66
Rouge 3D Model	Clear Mission 57
Route 99 Music	Clear Mission 50
Seaside HIll Music	Clear Mission 93
Shadow 3D Model	Clear Mission 64
Silver 3D Model	Clear Mission 89
Sky Babylon Act 1/2 Mix Music	Clear Mission 74
Sonic 3D Model	Clear Mission 7
Sonic Boom Music	Clear Mission 62
Sonic Heroes Theme Music	Clear Mission 90
Sonic Stage Music	Clear Mission 46
Sonic Statue Picture	Clear Mission 95
Special Stage Music	Clear Mission 17
Splash Hill Act 1 Music	Clear Mission 6
Star Light Music	Clear Mission 5
Starlight Carnival Act 1 Music	Clear Mission 80
Super Sonic Racing Music	Clear Mission 24
Tails 3D Model	Clear Mission 18
Throw It All Away (Theme Of Shadow) Music	Clear Mission 55
Time Eater 3D Model	Clear Mission 100
Toxic Caves Music	Clear Mission 59
Un-gravitify Music	Clear Mission 11
Unknown From M.E. (Theme of Knuckles) Music	Clear Mission 54
Vela-Nova Music	Clear Mission 69
What I'm Made Of Music	Clear Mission 91