Sonic Rivals 2

Sonic Rivals 2 has four main Single Player modes. Story Mode is the main single player mode. Players go through each of the game's battle modes and levels to advance the plot. Each zone has three acts and a boss, with the exception of the final zone. The characters are divided into four teams, each of which has their own story. The game introduces a new mode called Free Play. In this single player mode, players can choose any one of the eight characters and play through the zones in traditional 2D Sonic fashion. They can also try Time Attacking, or finding the ten hidden Chao in the levels. There are no opponents for this mode. This is a first for many of the characters featured. In addition, players can also try the Cup Circuit and Single Event modes. Races and battle can be customized in every aspect, and players can try to earn cards by completing challenges. There are 150 different cards to collect, and each is tied to a certain achievement. For example, getting an S Rank in Knockout Mode unlocks a card of Mephiles the Dark. The cards themselves contain art from various older Sonic games, and can unlock things such as alternate suits for the characters. Unlike the first game, only one card is needed to unlock a suit; and each character has four suits instead of the original three. The cards also unlock the Cup Circuits, and Chao Detectors for the Zones.

Each stage has three acts and a boss, instead of the original game's two. Acts one and three are races, and act two is always a battle. In the story mode, the races may be substituted with single character missions such as "Time Attack,” "Collect X Rings,” and other challenges. Certain stages can be skipped in the story, depending on the character chosen.

Sonic Rivals 2 boasts a new multiplayer "Battle Mode" with six different types of competition in addition to the main race mode. These modes are also worked into the story. The lengths of the battles can be set though the selection menus. In Knockout, each player starts with three rings. Players must knock all of the rings out of their opponent and then attack them to win. The first player to get the set number of knockouts wins. In Rings Battle, players have a set amount time to collect as many rings as possible. The player with the most rings at the end of the time limit wins.

Capture the Chao is a Sonic themed version of Capture the Flag. Players must steal a set number of Chao from their opponent's base and bring them back to their own base with their own Chao still there to win. In Laps Race, the first player to complete a set number of laps around the track wins. King of the Hill has an Omochao stationed at the top of the level with a light beam. Players earn points by simply standing under it. The first player to get the set number of points wins. Tag is a Sonic themed cross between Hot Potato and Tag. Each player has a time limit that drops when they hold the bomb. Players pass the bomb by attacking the other player. The first player to have their time limit expire loses.

Sonic and Tails are investigating the disappearances of several Chao. They discover that Doctor Eggman has stolen the Chao and concealed them inside a haunted mansion. He plans to feed them to an interdimensional beast called the "Ifrit" to make it invincible, then release the Ifrit to destroy the world. However, as he needs the seven Chaos Emeralds to open the portal to the Ifrit's dimension, he secretly hires Rouge to collect them. When the Master Emerald also goes missing, Knuckles teams up with Rouge to find it.

Meanwhile, Silver the Hedgehog returns from the future, which has been ruined by the Ifrit. In order to prevent this, he searches for and steals the Chao in order to hide them and keep them safe. Espio, having been hired to investigate the disappearances, initially believes Silver is taking the Chao for nefarious purposes, but agrees to join forces after discovering his true motivations. Elsewhere, Shadow is met by Metal Sonic, who is being used by Eggman as a communication device. Eggman reveals that the true perpetrator is Eggman Nega disguised as himself, who learned of the Ifrit by accessing Gerald Robotnik's journals. Shadow and Metal Sonic set out to retrieve the Chaos Emeralds before Nega does.

All of the teams meet up at the haunted mansion to confront Nega. Despite Rouge only collecting six of the Emeralds, the portal to the Ifrit's dimension still opens, and Nega dispatches his own "Metal Sonic 3.0" robot to awaken the Ifrit. Despite possessing some of their friends' minds, the Ifrit is successfully defeated by the heroes. Shadow and Metal Sonic close the portal, trapping themselves and Eggman Nega in the Ifrit's dimension. However, Metal Sonic reveals the seventh Chaos Emerald inside his chassis, and Shadow uses it to teleport them back to their dimension, leaving Nega behind.

Sonic and Tails free all the Chao, taking them back to a Chao Garden to relax. Knuckles uses Eggman Nega's Emerald Detector to find the Master Emerald, only for Rouge to steal it and run off. Silver returns to the future, hoping things have been made right, while Espio is left to report to Vector on the state of the case.

Sonic Rivals 2 received "mixed or average reviews" from critics according to Metacritic, averaging a 60/100.[2]

In March 2009, Sonic Rivals was certified as part of Sony's Greatest Hits budget line, representing North American sales of at least 250,000. Sonic Rivals 2 soon followed.[10]