I have no idea how rare this is, except a lot. This is a Limited Edition from where Sega made a deal with a London aquarium which housed a real dolphin named Ecco (who would benefit from the proceeds).
A similar boxed set from Tides of Time sold for $200+ earlier this year, but was missing several items.
Auction Here - Buyer knows it is overpriced, but is hoping to solicit serious offers.
Also:
The Death and Return of Superman for Sega Genesis Pirate (GG)
Double Dragon II Sega Genesis Pirate
Elite 5 In 1 SNES Multicart - If I remembered my GG login, I would have just bought it for $7.00 and not posted
Nintendo Game Boy Advance SP Mario Limited Edition Red Pak
Sengoku 3 NEOGEO Aes Neo Geo
WAR IN THE GULF NES WITH BOX - Brazilian CCE Game
Super Mario Land 2 Six Golden Coins for Nintendo Game Boy Factory Sealed
Lot Of 26 Magnavox Odyssey 2 Games
Chase the Chuck Wagon Atari 2600
Mortal Kombat Picture signed by Ed Boon - Only 150 ever signed, this is #127 of 150. Given to select press from Midway.
John Romero's Daikatana FACTORY SEALED for Nintendo 64
EarthBound Anthology Fan Book Complete w/ 2 Media Discs
Maniac Mansion (C64 Disk) Lucasfilm Games 1987 New and Sealed
On Tradera (Swedish eBay) (Thanks Jean!)
I know like nothing about these or Tradera in general.
Some sort of Sega Megadrive Rental Thing - No idea what sort of case this is, but looks awesome.
NBA ALL-STAR CHALLENGE MD
PGA EUROPEAN TOUR MD
Castle of Illusion
VIDEO GAME ORGANIZER ORIGINAL till Sega Mega Drive