From Sonic Retro
The Special Combination (スペシャルコンビネーション) is an Item Box power-up featured only in Sonic the Hedgehog 4: Episode II that enables the player to destroy all on-screen enemies. Unlike other power-ups, Item Boxes containing the Special Combination are golden monitors.
The Special Combination is a rare item that can only be found in Oil Desert Zone Act 2 and Sky Fortress Zone Act 2. When picked up, the screen will turn dark, and Sonic and Tails will start bouncing all over the screen in ball form, destroying any Badnik they collide with. During this, the player is prompted to repeatedly press / to increase the Ring and point value of the attack. The attack lasts for five seconds, and finishes with Sonic and Tails coming back together for a unified slam into the ground that destroys any remaining Badniks and awards the player with the bonus Rings and points.
|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 | Rocket Shoes | Propeller Shoes | Eggman Mark | Combine Ring | Forcejewel | Power Core | Light Cores | Special Combination|
|Level Objects||Monitor | Spring | Spikes | Checkpoint | Time Warp Plate | Signpost | Goal Ring | Giant Ring | Capsule | Button | Bumper | Speed Booster | Air bubbles | Chao container | Item Panel|
|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|