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"Bullet Physics SDK: Open Source Simulation Library for Robotics and Games" Author: Erwin Coumans Year: 2015 (Presented at GDC and released formally in publications around this time). bullet 2 the top digital playground new 2015
Bullet 2 the Top: A Modern Mobster Epic by Digital Playground : An arcade-style "bullet hell" shoot-'em-up video game 1