The plot is similar to Sonic 2 but it changes
- Shadow the hedgehog/Super Shadow
- Rouge the bat/Super Rouge
- Dr. Robotnik/Eggman
Eggman appears in his Egg mobiles as a boss to fight:
Robotnik appears in his customized Eggmobiles at the end of each Zone. This means, he will usually appear at the end of each second Act, except in the Metropolis Zone (which has three Acts) and the Death Egg Zone (which has only one). Eight hits are required to defeat each boss.
Shadow and Rouge's abilities
There are many abilities that Shadow and Rouge have These include:
- Spin dash
- Spin attack
- Whirl dash
- Chaos control
- Chaos blast
- Emerald Hill Zone
- Chemical Plant Zone
- Aquatic Ruin Zone
- Casino Night Zone
- Hill Top Zone
- Mystic Cave Zone
- Oil Ocean Zone
- Metropolis Zone
- Sky Chase Zone
- Wing Fortress Zone
- Death Egg Zone
Shadow's game play is similar to Sonic's. Rouge's gameplay is similar to Tails and Knuckles.
In two player versus mode, players compete against each other - either as Shadow or Rouge - in a split-screen race through three regular zones and one special stage. Regular zones include Emerald Hill, Casino Night and Mystic Cave and have different music from their one player counterparts, while the Special Stage is similar to the Emerald Stage in single player. In the regular levels, players are ranked in five areas (score, time, rings held at the end of the level, total rings collected, and number of item boxes broken), with the player scoring highest in the most levels winning the round, while in the Special Stage, players compete to obtain the most rings. Once one player finishes one of the regular levels, the other player must finish the zone within 60 seconds or lose a life.
In case of a tie, an additional Special Stage round must be completed. Also, to heighten the stakes, there are two unique items in versus-mode: a teleport item that instantly switches positions between players in a zone, and a Robotnik item that damages the unlucky player. Furthermore, an optional setting allows that all item boxes in two-player mode are only teleports.
There are 7 special stages. When Shadow or Rouge have collected at least 50 rings and he and/or she hits a Star Post, a red halo of stars will briefly float above it, which Shadow and Rouge can then jump through to get to a special stage.
Special Stages track Shadow and Rouge from behind while he runs through a three-dimensional half-pipe course filled with rings and bombs. A set amount of rings must be collected to pass through three checkpoints and eventually obtain the emerald itself. Playing cooperatively with Rouge raised some of the ring targets in the early stages, for example in the beginning of the first stage 40 rings were required to pass rather than 30. The order of stages is fixed in rising difficulty, and Shadow and Rouge cannot enter the next stage without passing the previous special stage. Whether the player is able to obtain the emerald or not, Shadow and Rouge are transported back to the last lamp post he hit in the zone when the special stage is over and has zero rings.
On return from a Special Stage, the entire zone is reset (except the game timer) - the player is without rings but all the collected item boxes and rings reappear (although unfortunately so do the badniks). Also, if Sonic activates a Star Post, all the Star Posts before that one will be activated as well, whether or not with 50 rings in hand. This created a tactical element to getting the most out of each zone in terms of opportunities to grab Emeralds. It is possible to collect all seven within Emerald Hill Zone, provided the player is careful with the order in which Star Posts are activated (and indeed, very skilled at the Special Stages.
That's all the info.