Alex Kidd in Miracle World

Continue mode cheat

At the game over screen Hold up and press 2 Eight times
Street Fighter 2 the World Warrior

To select the same character in 2 player mode and also change the colour suit of the character

At the CAPCOM logo using player 1 control pad press Down, R, Up, L, Y, B and you will hear a sound that the cheat has been entered in correctly. Also the background will turn blue

Sonic The Hedgehog (Mega Drive/Genesis)

Level Select cheat

At the title Screen press Up, Down, Left, Right, Hold A and press start and you will see on screen a list of different levels to select.

Street Fighter 2 Turbo (SNES)

10 stars turbo cheat

After the CAPCOM logo on control pad 2 press Down, R, Up, L, Y, B. You will hear a sound to confirm the cheat is correct. You can select up to 10 star speed.