Dark Holes 2

Arguably the most challenging game ever created. It was instantaneously met with critical adoration for allowing people to die several thousand more times in a row, having a lot of bosses that were big guys holding sharp things, and for generally being unhelpful.

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Deluxe Addition

A deluxe addition, called Holler of the First Din, was later released that added two-hundred enemies per square inch to each area. In an interview, the game's developer said:

"Playing this is impossible and not recommended."

A new optional boss was also added. His sword is bigger than the other bosses' swords.