I rented the game, but I dont think I understand your question. Like BAB said, you unlock hidden games by starting up the games a lot(like 50 times) I dont know what your talking about tho.
There are 5 secret games in Sonic Mega Collection. These are the ways to get them!
First, how to kill a game log. Game Logs are important in this code. Enter a game (Sonic 1, for example), and before it loads, you'll notice it saving to the memory card, and then it says ''Game log recorded''. Then the game starts. Well, all you do is enter the game, let the log record, then press ''Z'' and exit the game. Then repeat process like 20 times until the Game Log doesn’t show up anymore at the start! You have just killed a game log!
Now for the methods!
Flicky (2 known ways)
1) Have an Sonic Adventure 2:Battle save on memory card
2) Kill Dr. Robotnik's Mean Bean Machine game log
Blue Sphere (2 known ways)
1) Have Phantasy Star Online save on memory card
2) Kill Sonic 3d Blast game log
Knuckles in Sonic 2 (1 known way)
1) Kill Sonic Spinball game log
Sonic 3 & Knuckles (1 known way)
1) Kill Sonic 1, 2, 3, & S&K game logs
Ristar (1 known way)
1) Kill Sonic 3 & knuckles game log.
_ Contributed By: Psychu, Source: Nigoli