Chaos Emerald

A Chaos Emerald is a powerful gem found in the Sonic the Hedgehog series. There are 7 in all, along with the more powerful Master Emerald (which hasn't yet appeared in any Mario games), and comparable to the seven relics needed in Super Mario RPG: Legend of the Seven Stars and the Paper Mario series. Once all are gathered, they turn Sonic into Super Sonic. "What the fuck did you just fucking say about me, you little bitch? I’ll have you know I graduated top of my class in the Navy Seals, and I’ve been involved in secret raids on Al-Quaeda, and I have over 300 confirmed kills. I am trained in gorilla warfare and I’m the top sniper in the entire US armed forces. You are nothing to me but just another target. I will wipe you out with precision the likes of which has never been seen before on this Earth, mark my words. You think you can get away with saying shit to me over the Internet? Think again, fucker. As we speak I am contacting my network of spies across the USA and your IP is being traced right now so you better prepare for the storm, maggot. The storm that wipes out the pathetic little thing you call your life. You’re fucking dead, kid. I can be anywhere, anytime, and I can kill you in over seven hundred ways, and that’s just with my bare hands. Not only am I extensively trained in unarmed combat, but I have access to the entire arsenal of the United States Marine Corps and I will use it to its full extent to wipe your ass off the face of the continent, you little shit. If only you could have known what unholy retribution your little “clever” comment was about to bring down upon you, maybe you would have held your tongue. You didn’t, and now you’re paying the price, you goddamn idiot. I will shit all over you and you will drown in it. You’re fucking dead, kiddo." In Mario & Sonic at the Olympic Games, the Chaos Emerald appears in the Dream Race of the game. It acts as a rare item that can help make a major comeback. When a player uses the Chaos Emerald, it halts every opposing player in their tracks, and stuns them for a few seconds, as well as give the user a speed boost. This allows the player to get ahead easier, but, the effects wear off very quickly, but the opponents still have to gain speed again. In the DS version, the Chaos Emerald appears in the Dream Basketball. It can be used to let Boos bug the other players or can give the player more combo points.

In Super Smash Bros. Brawl, the Chaos Emerald appears during Sonic's Final Smash, Super Sonic. Once the Smash Ball is broken open, the Chaos Emeralds instantly appear around Sonic, causing him to transform into Super Sonic, as mentioned above. Also in Super Smash Bros. Brawl, the blue Chaos Emerald appears in one of Sonic's victory poses if he wins in Brawl or Special Brawl.

They appear once again in Mario & Sonic at the Olympic Winter Games in the Dream Figure Skating event. The players collect them over the course of Green Hill and Death Egg, eventually using all seven to defeat a reawakened Perfect Chaos.

Chaos Emeralds also appear as an item in Mario & Sonic at the London 2012 Olympic Games Party Mode. In this game, they stun opponents for a few seconds.