Bonus Stage

Bonus Stages, also referred as Mini Games, are extra, optional mini-games in the games in the Sonic the Hedgehog series, where the player usually enters a different type of Stage with a different gameplay style. Bonus Stages are usually meant as a place where the player can collect Rings, points, extra lives or other items when passing through a Zone. In each game, there's different way to enter Bonus Stages as such being transported after collecting certain amount of Rings, finding hidden Giant Rings or after passing through the regular Zone. Bonus Stages and their gameplay styles vary between each games, as they have featured many different gimmicks such as gumballs, slot machines and other types of mini-games.

Bonus Stages are not to be confused with Special Stages, as the objective of the Special Stages is that the player collects something in order to obtain a Chaos Emeralds. Regardless, some of Special Stages have retrain the same role as Bonus Stages in several games.

Sonic the Hedgehog Spinball
There are four different Bonus Stages in Sonic the Hedgehog Spinball, all of which take place inside a regular pinball cabinet. In this game, the player can play three Bonus Stages after passing through the regular levels, as the fourth level only becomes playable if the player has collect all the Rings from the three previous levels. When playing in the Bonus Stages, Sonic himself can be seen playing the pinball table in the reflection of the windows in the background.

Each Bonus Stage has its own requirements for gathering more points to the total score. When playing, the player has three pinball balls to use during the Bonus Stage. Completing them will rewarded the player with "Rising Jackpot".

In the 8-bit version of Sonic the Hedgehog Spinball, there are different three different Bonus Stages which the player can enter in the same manner as in the 16-bit counterpart game. Here, however, Sonic appears the pinball sections and is able to find treasure boxes with points, Rings, extra lives and Continues.

Sonic the Hedgehog 3 & Knuckles
Sonic the Hedgehog 3 and its add-on continuation Sonic & Knuckles have three different Bonus Stages, which the player can enter by making a Star Circle appear above aStar Post when having collected a certain amount of Rings. While Sonic the Hedgehog 3 only feature one type of Bonus Stage and Sonic & Knuckles features two, the locked-on version of the game, Sonic the Hedgehog 3 & Kncukles features all three Bonus Stages. Each Bonus Stage's gameplay and purpose are different.

Sonic Labyrinth
In Sonic Labyrinth, a hidden Bonus Stage can be entered by finding the closed door with "BONUS" mark on it in Labyrinth of the Sea. The player has to enter a cannon to be launched into the direction where the door is located. After entering the Bonus Stage, the player can collect a huge amount of Rings within 30 seconds, where each Ring adds 25 Rings to the score. After clearing the Bonus Stage, the player obtains the sixth Chaos Emerald and can clear the game with the good ending.

Knuckles' Chaotix
There are hidden Giant Rings set around on each attraction in Knuckles' Chaotix, which can transport into the Bonus Stage, if the player has least 20 Rings. The player gets transported into different dimension, where the playable character without Combi partner falls endlessly down to the void, while there are numerous amount of power-up boxes floating around. The player can collect Rings and points from certain power-up boxes, while he/she can be sent out of Bonus Stage by getting hit on Exit boxes or running out of Rings.