From Sonic Retro
The Fire Shield or Flame Shield, known as the Flame Barrier in Japanese (フレイムバリア Fureimubaria), is a power-up first introduced in Sonic the Hedgehog 3. It is a variant of the standard Shield, and like most other items is found inside monitors during gameplay. In addition to serving as a one-hit barrier against damage / life loss, the Fire Shield makes its lucky possessor invulnerable to fire-based attacks, allowing them to stroll across boiling lava and take flamethrowers to the face with a complete absence of concern.
While all variants of this shield prevent fire damage, its initial incarnation in Sonic the Hedgehog 3 (and, by extension, Sonic & Knuckles and Sonic 3 & Knuckles) is lost if the character goes underwater; and when used by Sonic replaces his Insta-Shield double-jump move with a rapid horizontal fireball attack, allowing him to blast forwards at a high speed and break any objects that a Spin Dash can. Sonic 3D had a Fire Shield, but no water to lose it in and no double-jump attack for it. In Shadow the Hedgehog, the Fire Shield causes minor damage to any enemy that pierces it.
It returned in a few challenge acts in Sonic Generations with its dash attack and fire protection intact. When the "Flame Shield Challenge" has been completed, the Fire Shield can be bought in the skill shop and, if equipped, can be activated at any time for Classic Sonic by pressing /.
The Fire Shield appears in iOS/Android remake of the original game and its sequel if you set "Items" to "S1+S3" or "S2+S3" in the Level Select menu (or place a Fire Shield monitor in debug mode). It behaves exactly as it does in Sonic 3 & Knuckles, including the fireball dash and disappearing when it touches water. In the Sonic 2 remake, the Fire Shield also appears as a random item in VS. Mode.
It appears again in Sonic Lost World as a power-up the player can receive from Miiverse in the Wii U version, or found within levels in the 3DS version. It does not come with the ability to perform the fire dash, but it still protects against fire.
The Fire Shield appears again in Sonic Mania, where it can burn down bridges in Green Hill Zone and set the oil on fire in Oil Ocean Zone. It also protects the player from freezing in Press Garden Zone and destroys anything made of ice by contact.
|Items in the Sonic the Hedgehog Game Series|
|Collectibles||Ring | Red Star Ring | Emblem | Chaos Drives | Material|
|Power-ups||Shield (Water, Lightning, Fire, Gold) | Invincibility | Power Sneakers | Power Core | Light Cores|
|Level Objects||Monitor | Spring | Spikes | Checkpoint | Time Warp Plate | Signpost | Goal Ring | Giant Ring | Capsule | Button | Bumper | Speed Booster | Chao Container|
|Powerful Items||Chaos Emeralds | Super Emeralds | Master Emerald | Time Stones | Chaos Rings | Precioustone | Sol Emeralds | Jeweled Scepter | World Rings | Excalibur | Phantom Ruby|
|Weapons||Piko Piko Hammer | Chaos Energy Cannon | Caliburn | Wispon|
|Devices||Remote Robot | Combi Confiner | Mother Computer | Nega's Camera | Arks of the Cosmos | Miles Electric|
|Other||Chili Dog | Scepter of Darkness | Cacophonic Conch|