

Blue Sphere, known as Special Stage Mode in Sonic & Knuckles Collection, is an easter egg video game built into the Sonic & Knuckles cartridge for the Sega Mega Drive, accessible by attaching any Mega Drive game cartridge (other than Sonic the Hedgehog 2 or Sonic the Hedgehog 3) into the Sonic & Knuckles lock-on port. Blue Sphere is a collection of Special Stages in the same style and engine of those featured in Sonic the Hedgehog 3 and Sonic & Knuckles. If the cartridge that is locked on to Sonic & Knuckles is the original Sonic the Hedgehog (Sonic Classics, the Nick Arcade and Simon Wai prototype versions of Sonic the Hedgehog 2 will also work), then the full game of Blue Sphere is accessed with all stages. Most other cartridges will allow the player to access only a single stage of the game, based on the cartridge's ROM header and the stage's code in the full Blue Sphere game. Some cartridges with particularly large ROM file sizes (including Phantasy Star IV: The End of the Millennium and Super Street Fighter II: The New Challengers) will not load Blue Sphere, but will instead boot Sonic & Knuckles as normal. Locking on Sonic & Knuckles to another copy of Sonic & Knuckles will also load the game normally.

Platform / Adventure / Arcade / Action
Sonic and Tails are back with three times the fun and three times the trouble! Dr. Robotnik is building the ultimate super-weapon with the help of Knuckles, but you can stop him by getting the Chaos Emeralds first. Rip across snow and water on Sonic's new jet skateboard or zip underwater in Tails' "Sea Fox". But look out - Nack the Weasel is after the Emeralds, too!

Platform / Adventure / Arcade / Action / Science fiction
This is a completely different game than its 16-bit counterpart on the Genesis/Mega Drive, and was originally released on the Sega Game Gear and Master System. The Sonic the Hedgehog 2 game marks the debut of Miles ‘Tails’ Prower, Sonic’s best pal, who is then seen recurring in the series. Assist Sonic to rescue Tails, who has been kidnapped by Dr. Robotnik in this platform video game. In exchange of Tails’ safety in this Sega Game Gear video game, the evil scientist asks that the six Chaos Emeralds be given away to six robots, so he can dominate the entire globe. With advanced ability of Sonic to smash through walls and grab back scattered rings hit by enemy, this platform video game is made even more exciting. Join the protagonist in the Sonic the Hedgehog 2 game as he rides a mine cart, a hang glider or skims through water surface in his rescue attempt. With seven zones and three acts each, this Sega Game Gear video game is a rollercoaster ride where you get rewarded at the end of each act.

Lazy Jones is essentially a collection of fifteen smaller sub-games. The game takes place inside a hotel with three floors, connected by an elevator. The character is a lazy hotel employee who does not much care for his work, but prefers to sneak into the rooms to play video games instead.

Platform / Arcade / Action / Kids
Take to the skies with Balloon Kid. You'll have to think light as you float across the most unfriendly skies around. Nasty flying creatures will test your piloting skills, but don't go too low because even nastier enemies await you on the ground. Get extra bonuses by gathering all the balloons you can for a series of challenging tests of skill. Take a big gulp of courage and give Alice a hand as she searches for her missing brother. Play alone or use your Video Link cable to race against a friend. Either way, Balloon Kid will give you a lift.

Platform / Adventure / Arcade / Action
Dizzy is an egg living in a world of magic and fantasy. The basic concept of the game is to move around the world, finding various items and collectibles, and to use them in the right locations. Dizzy has no special skills or abilities, save for his remarkable feats of somersaulting, and must solve all problems he faces with the clever use of one or more items.

Platform / Hack and slash/Beat 'em up / Adventure / Action
Thrilling new cinema screen! Follow the story of Ryu's epic adventure through Tecmo's movie-like Cinema Screen Animation. As you complete each level, a new part of the story unfolds. Exciting new powers and weapons! Over the years Ninja Ryu's fighting skills have improved to include fantastic new powers and weapons. Action-packed Ninja adventure! Can you get Ryu through his most challenging adventure as he battles the hideous ancient forces of darkness to save mankind? The Ultimate Ninja Challenge!

Chuckie Egg is an action platformer featuring a turn-based multiplayer mode. As Hen-House Harry, the player must collect the twelve eggs positioned in each level, before a countdown timer reaches zero. In addition there are piles of seed which may be collected to increase points and stop the countdown timer for a while. The player starts with five lives, and an extra life is awarded every 10,000 points.