well, of course it is not allowed to use ripped graphics (like Zelda-, Sonic- or Super Mario-sprites) in a game which is meant to be sold.
Kind of funny you should mention those three. Since BlueMonk has posted a game based with graphics from Zelda, Sonic, and Mario.
As long as you don't gain profit, the companies are happy.
another bot
What did he/she do this time?