A game that says it is the hardest game on Earth, and it is probably telling the truth
Bob: JOSH! I JUST GOT TO A NEW LEVEL IN THE WORLD'S HARDEST GAME!!!
JOSH:...ok
One of the most notorious Flash games of all time.
You are a red square. You must get from Point A to Point B, getting all the coins along the way. Sounds simple?
What if we added a bunch of insta-kill blue circles that move insanely fast in crazy patterns that are extremely hard to memorize? And by the way, you also have to formulate a strategy to get around those damned circles and then execute said strategy, which can be next to impossible unless you have a lot of patience. Have fun!
Despite the frustrating nature of The World's Hardest Game, it was quite well-received, to the point that it received three sequels. There has also been quite a few people who have managed to complete all four games in the series without dying a single time.