Enraged developers are threatening to boycott one of the world's most popular game engines. But what has Unity done to spark such huge backlash?

Unity proclaimed that on Jan. 1 it would be implementing a pay-per-download pricing model to charge developers a flat fee any time someone installs a video game utilizing Unity software.

OTEE's Unity game engine is now available with Windows publishing capabilities.

After Unity on Tuesday announced a new pricing plan for developers using its engine, a wave of anger, fear and confusion spread across the global game development community.

Mega Crit switched to the free engine after the install fee debacle that led to the resignation of Unity's CEO.