- You may be looking for Hot Pursuit (Modern).
Hot Pursuit is the second Challenge Act of Speed Highway Act 1 in the console/PC version of Sonic Generations. It is unlocked after clearing every Stage in the Dreamcast era and is playable only as Classic Sonic.
This act takes place within a slightly modified version of Speed Highway Act 1. The differences primarily take the form of additional metal boxes and platforms to jump on.
In this Challenge Act, the objective is to reach the Goal Plate at the end of the course, all while avoiding Sprinkler enemies that chase the player. To reach it, the player should keep moving as much as possible in order to not get hit by the falling Bombs that are being dropped throughout the entire Act.
The level begins very similarly to the normal version of Speed Highway Act 1, starting the player off on a loop before having them run across buildings and roads almost identically to the regular Act, and finally entering the large skyscraper. If the player does not stay in one area for too long, they will be able to avoid the Sprinkler's bombs and progress through the stage quickly.
The only section with a large difference is the skyscraper near the end. The player must climb platforms upward and down a hall to the left in order to hit a switch, then jump back down and go through the newly opened pathway under the previous platforming section. The player can find the Goal Plate at the other end of a stretch of falling platforms.