0%
According to Ethan Einhorn, the producer for the collection, the three "lock-on" games (Knuckles in Sonic 2, Sonic 3 & Knuckles, and Blue Sphere) were not included citing "tight development times", and that including them would have meant "dropping several titles from the collection altogether", specifically the aforementioned nine unlockable games since "they all required unique emulation solutions".
Master System [26]
Game Gear [8]
MegaDrive [343]
Saturn [21]
Dreamcast [8]
Gameboy [17]
Gameboy Color [18]
Gameboy Advance [15]
Nintendo 64 [47]
GameCube [3]
Nintendo DS [23]
Wii [50]
Nintendo 3DS [68]
Nintendo Wii U [37]
PlayStation [91]
PlayStation 2 [137]
PlayStation Portable [96]
PlayStation 3 [449]
PlayStation Vita [241]
PlayStation 4 [391]
Xbox [16]
Xbox 360 [102]
Xbox ONE [1]
Retail (Code) [2]
Retail (CD/DVD) [70]
Retail (3 1/2 Floppy) [1]
Retail (5 1/4 Floppy) [5]
Digital Download [14]
Steam [868]
Origin [59]
U-Play [13]
Battle.net [5]
Epic Games [2]
Playfire [1]
Nvidia Shield [6]
iOS [19]
Android [82]
Brick Game [1]
Konami [1]
Tiger Electronics [5]
AtGames [3]
Techno Source [1]
1UP Arcade [1]
Pandora [1]
