Planet Wisp itself is a natural mountainous area, with stone covered by spring green grass, lots of vegetation, and tall gray trunks that end in flat, small platforms. Because of Dr. Eggman's actions though, Planet Wisp is industrialized in some areas, having gigantic red robotic factories under construction and a complex for Eggman's tractor beam generator. Some rivers are polluted as well, with a strange purple liquid flowing through them.
Planet Wisp would be the ninth and final areaModern Sonic and Classic Sonic would travel to when trying to escape White Space. By speeding through Planet Wisp, the Sonics were able to fix space, thereby restoring Planet from its lifeless state, and freeing a frozen Charmy Bee in the progress. When the Time Eater later got destroyed, Planet Wisp seemingly returned back to its rightful place in the timeline.
Planet Wisp is a straight-foward stage. The start of both Acts will take place outdoors, where the player will have to do some platforming to avoid falling into bottomless pits. As they progress however, Planet Wisp will move into Dr. Eggman's complexes, which have many obstacles, such as missile launchers and saws, to stop the player.
Act 1 is filled with small rooms that are full of obstacles, such as moving saws and missile launchers. The player can also use the Pink Spikes to move Gear Platforms that will take them to other places or open paths.
Planet Wisp Act 1 starts with Classic Sonic running through the nature of Planet Wisp. Act 1 features Pink Wisps, which the player can use to turn into the Pink Spikes and climb walls.
As Classic Sonic progresses through the Act, he will soon find himself in Dr. Eggman's factories. When Classic Sonic gets out of Eggman's factories, he will pass through a Goal Plate to finish the Act.
Similar to Act 1, the start of Planet Wisp Act 2 has Modern Sonic running through the nature of the planet. There, he will have to make some simple platforming and Grinding parts to get across giant bottomless pits and purple rivers.
Eventually, the player will use an Orange Wisp to turn into the Orange Rocket to enter a gigantic robot factory. Most of this section is 2D side-scrolling. As with Act 1, the player will have to avoid obstacles such as moving saws and missile launchers to advance. Some sections also have the player having to jump onto moving platforms to pass through pits.
Eventually, the player will get to the top part of the factory, which will have a Goal Ring at the end.
While the Act 2 remix of Planet Wisp's music sounds almost exactly like the original music (Act 1 to be percise), the Act 1 remix of Planet Wisp's music has a darker tone caused by using a techno theme, which is reminiscent of the music for the bad future versions of Sonic the Hedgehog CD's Rounds, also sounding similar to Asteroid Coaster's music from Sonic Colors. Both of them share the theme of Eggman destroying the environment.
At certain points in Act 1, there can be warp glitches when using Pink Spikes, taking the player to the last place they used Pink Spikes.
This is the only Modern Era level without an urban theme. It is also the only forest-themed stage in the game.
This is the only Modern level to have the Goal Ring appear in a side-scrolling section of the level in the main Act.
This is the only stage in the console version of Sonic Generations to appear exclusively on Nintendo consoles prior to this game.