This trainer has been made for Sonic Generations.
It should support most game versions, tested with v1.0.

Download link:
Sonic Generations +4 trainer
Sonic Generations +4 CEtrainer

First run the trainer.
Then run the game.
Hit number keys on the numerical keyboard to turn options on/off. Make sure that NumLock is active.

There are 4 options in this trainer:

1. Unlimited Rings
2. Unlimited Lives
3. Unlimited Time
4. Invincibility

NOTES:

Unlimited Rings: You will always have 200 rings.

Unlimited Lives: 99 lives.

Unlimited Time: The time is freezed to 1 sec.

Invincibility: It will keep you invincible just as when you are blinking. I guess you can still drown, fall and similar things so it may not protect you from every kind of death.

What is a CETRAINER file? The answer is here:
http://www.szemelyesintegracio.hu/cheats/41-game-hacking-articles/340-whats-a-cetrainer

Recommended for those who are afraid of viruses and prefering downloading small files.

You can send Your comments and bugreports to Ezt a címet a spamrobotok ellen védjük. Engedélyezze a Javascript használatát, hogy megtekinthesse.

Some information about virus reports for trainers generally. Read it before You post something about some virus.
http://szemelyesintegracio.hu/cheats/41-game-hacking-articles/212-trainers-and-anti-vir-softwares