8-bit Hero - 9-Volt

How to play: (10 points to pass)

Compare the difference between the two screen, and point out the incorrect pixel at the tough screen.

Level-specific information:

Level 1:
Mario's picture will be used. Remember the colour of all 15 pixels, and things will become easy. The part of Mario's sprite used for this game will never change. That's just plain easy.

Level 2:
The pic of Link, from the original Zelda 1, will be used. The strategy used will be the same as above, with the number of pixels changed to 24.

Level 3:
This time, you'll face the sprite of Popo, from Ice Climber. The strategy used will still be the same as above, with the number of pixels changed to 35.