New Super Mario Bros 2 Internet Archive ((link))

She told Luigi why they’d buried the prototype. Marketing had feared the idea of a coin-obsessed sequel would look greedy; executives worried about copycats; manufacturing schedules interfered. The team had half a year to complete the game and, worn thin, made compromises that broke their original vision into something palatable and predictable. They shipped a beautiful game—one millions loved—but a piece of them had been severed, tucked away like a lost demo disc.