-sonic1 :
ks0 : one hit and the last boss is defeated
ks1 : got all the chaos emeralds

-sonic2 :
ks0 : Chemical Plant 1, super sonic ready to be activated
ks1 : super sonic activated, last battle before Death Egg
ks2 : one hit and the last boss is defeated

-sonic3 : 
ks0 :Tails with all the chaos emerald.
Then reset the game (tab key). If you choose the first save slot, you will be able to begin the game at every stage with the super sonic ability.

-sonic&k : Sonic & Knuckles :
ks0 : super Knuckles available, in the Hidden palace.
ks1 : becoming super Sonic can't help you defeating the  boss.
ks2 : Knuckles : one hit and the last boss is defeated
ks3 : Sonic : one hit and the last boss is defeated

-licr : light crusaders :
ks0 : before the last (and easy) battle
ks1 : beginning of the 8 worlds

-sor3 : Streets of Rage 3 :
ks0 : robot Y almost dead (end of the game)
ks1 : just before the fight with robot Y
ks2 : robot X almost dead
ks3 : Will you save the Chief of Police or not ? You only have to decide.
ks4 : Roo enabled. Come back with the B button if you want to change the difficulty.
ks5 : Shiva enabled
ks6 : The almighty Shiva fights Mona and Lisa