Swift and Ava (1993)

Swift and Ava is a Sega Genesis and Sega CD game released in October 25, 1993. It marks the official debut of Swift and Ava.
== Plot Description ==
Over the 30 years after the Death Egg saga, Sonic, Tails, Knuckles, and Amy were widely regarded by everyone as the greatest heroes on the planet. Speaking of the Death Egg, Eggman created his biggest one yet, and the four greatest heroes are attacking it, and Skye, son of Tails plans to stop them so that he can take it for himself just in case there is a bigger threat than Eggman. Help Skye succeed at doing so and play as Swift and Ava to defeat Sonic, Tails, Knuckles, Amy, and their eight friends.
== Gameplay ==
Swift and Ava is a high speed platformer game where you can play as 2 characters with different play styles.
Both can spin jump with C.
=== Swift ===
Swift is the water/ice hedgehog boy who is ready to slip through obstacles and dive into adventure!
Press C in mid-air to do a Freeze Wave attack. Press and hold that button to do a Drop Dash (you don't need to be in ball form, and you can even climb up walls with this manuever!).
He can homing attack by pressing B when an enemy is near.
Swift can swim like the spaceship you're playing as in a shooting game can float. Just use the directional keys, he moves really fast underwater.
=== Ava ===
Ava is a fire/geo hedgehog girl who is ready to thrash through her foes while thinking quick!
Press and hold B to Fire Boost, letting you plow through enemies, brick walls, and more. Ava will climb the wall while this maneuver is done to an unbreakable wall!
Press C in mid-air to do a hammer attack (which lets you get out your hammer for one second, but it can let you bounce on enemies and surfaces if the maneuver is done below them!)
== Power-Ups ==
1UP - Lets you get another try.
Skater Mint - Turn every enemy you walk or run on into ice! Only Swift's levels have this item.
Spicy Pepper - Eat this and become an impervious fireball! Only Ava's levels have this item.
== Levels ==
=== Gaia City ===
The intro stage for both characters has them do cool stunts in the city and also learn the basics of their movements.