Quick VC questions about Sonic and Mario Original

[AW4L]

are there any cheats for these games?
i know in mario its a game over, but is there any way to get more lives or something or if there is a continue?

and same for sonic..

 

[kodd]

For sonic press up down left right on the dpad then a and + button on the title screen

 

[chronoswing]

you can always do the extra life trick in mario on world 3-1 just at the end the staircase thing before the flag, you jump on the last koopa coming down the steps, then you have to precisely land on the shell if you do it just right you will repeatedly hit the shell over and over acquiring you with unlimited one ups, hell let the timer run out and do it again. For a better explanation use gamefaqs.com