Let's see why these aren't hacked:
01. Sonic the Hedgehog - no HUD
02. Tetris - widescreen?
03. Duck Hunt - too many sprites, & the machine gun from Doom
04. Pacman - I know there are a million versions of Pacman, but one with those ghost faces?
05. Q-Bert - who knows, maybe that one was
06. The Legend of Zelda - Link doesn't move that slow; variable-width spacing? Without changing the dialogue?
07. Super Mario Kart - okay I'm board with this charade - they're obviously not hacks