The Sony PlayStation 2 is the highest-selling gaming console ever, with sales exceeding 160 million units. Minecraft is the most sold non-arcade video game, second only to Tetris in overall sales. Minecraft was never officially released on the PS2, but a developer has successfully ported Minecraft Pocket Edition version 0.6 to the PS2, allowing it to run without modded hardware. The port achieves frame rates exceeding 30fps despite the PS2's limitations, using a custom "OpenGL adaptor" and various strategies to manage the console's 32MB of RAM. The optimized version of the game is called OptiCraft.