Retail sales data from Spain has come out via the big Spanish magazine Hobby Consolas:
Metroid: Samus Returns (Nintendo 3DS) – 6,373
According to their report, Metroid: Samus Returns managed to sell 6,373 units in its first week (week 37, 2017 – going from September 11, 2017 to September 17, 2017). With Samus Returns releasing on Friday the 15th, this puts it at two days of actual availability.
To compare, the magazine also released lifetime sales to date (as of week 37 as well) for the previous Metroid title, Metroid Prime: Federation Force.
Metroid Prime: Federation Force (Nintendo 3DS) – 3,364
Considering that the latter game released over a year before Samus Returns and only managed to sell in that whole time a bit more than half of Samus Returns’ first week numbers, the Metroid II remake seems to have gotten off to a good start with a promising sales debut. It unfortunately also further puts into perspective how poorly Federation Force performed commercially.
For more comparisons, Monster Hunter Stories for Nintendo 3DS, which released a week prior to Samus Returns, moved 5,491 units, and PS4 title Yakuza Kiwami, which released two weeks prior, managed to sell 2,428 copies by week 37. The next step up for new releases is the racing simulation F1 2017 selling 11,092 units across three platforms with three weeks of lead-up to Samus Returns’ release. More sales data for week 37 is at the source link.