Since this IS the Retro thread, I felt like giving appreciation to a retro mascot. Might do more of these, not sure, so excuse the autism for a moment.
Q*BERT
You're an alien (?) who has to turn blocks into different colors. Other enemies such as snakes, pigs, red balls, and green things that revert your colors show up to mess you up. There's spining discs that you can step on that take you back to the top of the platform, but give you bonus points if you leave them alone. You can fall off platforms which will result in a life loss. When Q*Bert gets hit, he says a curse word (actually it's whatever language he speaks, just jumbled up as "@!#?&"). You can "finish" the game, as there are only 9 levels, but after you finish level 9 it just loops forever until you get a game over.