These are the glitches found in Sonic Generations.
Float in Crisis City[]
To do this glitch the player needs to go into the Blaze into the flames mission in Crisis City. On the part with the falling bridges if the player keeps jumping on the top bridge they will be floating in mid air. If you go to the first boss battle and you jump when the Eggman robot does his jump attack there is a possibility you can get stuck on the other side of the wall and be stuck painting and spinning and there's no way out of it it's an excellent the level or starting over the boss battle.