- Not to be confused with Death Egg II, from Sonic the Fighters.
The Death Egg mk.II is the final level in Sonic the Hedgehog 4: Episode II. After destroying his battleship in Sky Fortress Zone, the duo of Sonic and Tails finally reach Eggman's ultimate plan: the rebuilding of the Death Egg last seen in Sonic 3 & Knuckles, and this time he's built it around the Little Planet from Sonic the Hedgehog CD. Just like its predecessor, the level contains gravity switching. There are no enemies in this zone, just Eggman and Metal Sonic once again.
The first act sees the duo fighting Metal and Eggman again at the halfway point, and must dodge Metal's energy attacks. Attack Metal when he is discharging from his energy attack. Eggman cannot be attacked in this part, and acts as a sort of shield for Metal while he charges attacks to hit the duo. At the very end of the first act, Metal challenges Sonic and Tails to a Stardust Speedway-style death race, complete with a cover of the Bad Future theme. The second act is the final boss against Eggman in the heart of the Death Egg.
- Act 1 - A Duel with Metal Sonic
- Act 2 - The Beginning of the End