From Wiktionary, the free dictionary
From mega- + challenge.
megachallenge (plural megachallenges)
- An exceptionally difficult challenge.
2009, Kathleen Kryza, Alicia Duncan, S. Joy Stephens, Differentiation for Real Classrooms: Making It Simple, Making It Work[1]:They choose from a menu of regular challenges, superchallenges, or megachallenges.
