Games That Were Suppose To Sell Very Well/Huge, But Failed to Do So? (Devs+Publishers Expectations, not Fans)

[Soundwave]

GProgrammer said:
Brain Age: Concentration Training, aka Brain Age 3

Brain age 1 = 19 million
Brain age 2 = 14 million
Brain Age 3 = ?? vgchartz has numbers at 60,000

That really is one of the most stunning drop offs in gaming history, lol.