Rouge: The Temptress is the first Challenge Act of Seaside Hill Act 2 in the console/PC version of Sonic Generations. It is unlocked after clearing every Stage in the Dreamcast era and is playable only as Modern Sonic.
In this Challenge Act, Modern Sonic travels through Seaside Hill Act 2 at night. However, the Egg Pawns blocking his path are carrying small, circular shields, and all Sonic's attacks are useless because Sonic just bounces off the shields. He cannot simply jump over them, either, because they must be defeated in order to activate the blue barriers ahead which act as floors and/or prevent Sonic from falling into the water below. In order to defeat the Egg Pawns, the player must press the / button to summon Rouge. Rouge hovers in front of Sonic for a brief amount of time, spraying a line of hearts wherever Sonic turns. Should the hearts touch an enemy, the robot will instantly become lovestruck, as its eyes will be replaced by hearts and it lowers his shield. Sonic then has a short time to attack the Egg Pawn before it overcome its emotions. When it is destroyed, a new path appears ahead, or a barrier is lifted. After five seconds or so of spraying hearts, Rouge disappears in a puff of smoke. Once Sonic reaches the Goal Ring, the mission is completed, and the player is ranked according to his/her time.
- A peculiar animation glitch makes Rouge appear with two mouths on each side of her muzzle.
- This is the only time Seaside Hill in the entire Sonic the Hedgehog franchise has ever been shown at night.