auxochallenge
noun
A challenge that is easily surmounted the first time, and increasingly difficult on subsequent attempts.
Jillie easily navigated the platforming section of the level she was playing, but then died at the boss fight. Eager to take another try at the boss, her impatience and inattention resulted in failing the platforming section - and every time she failed it, her frustration just made it that much harder. Finally she put the controller down and tried to relax, knowing there was little point in tackling the auxochallenge until she calmed down.