[Week 11, 2002] HALO: COMBAT EVOLVED (MICROSOFT) – NO DATA
[Week 46, 2004] HALO 2 (MICROSOFT) - 260,000
[Week 39, 2007] HALO 3 (MICROSOFT) - 370,000
[Week 09, 2009] HALO WARS (MICROSOFT) - 65,000
[Week 39, 2009] HALO 3: ODST (MICROSOFT) - 212,000
[Week 37, 2010] HALO: REACH (MICROSOFT) - 390,000
[Week 46, 2011] HALO: COMBAT EVOLVED ANNIVERSARY – 48,000
[Week 45, 2012] HALO 4 (MICROSOFT) - 336,000
[Week 46, 2014] HALO: THE MASTER CHIEF COLLECTION (MICROSOFT) – 96,000
[Week 44, 2015] HALO 5: GUARDIANS (MICROSOFT) - 150,000

http://www.neogaf.com/forum/showpost.php?p=183850649&postcount=119

Even lower than ODST.

Yet not lower selling that the Anniversary and MCC releases, nor lower selling than Halo Wars.

"Lowest selling mainline Halo" would be more accurate, you'll get some flack for the thread title.

EDIT: Nevermind

Halo 4 was not the top selling game of all time in US for the franchise... It did have top revenue but lower unit sales than Halo 3 or Reach.

That is what I remembered... I even proved Halo 3 did sold more and VGC needed to adjust down Halo 4 sales.

Quite surprised to see that it sold less than 2 and ODST. Don't think it would be fair to compare numbers to 3 (the most hyped release ever), Reach (released during the 360s sales height) and 4 (released on a record breaking userbase).

However 150,000 units in one week in one country is still great. I'm more interested in how this one legs.

Spin?

What was 360's LTD in the UK when Halo 3 came out? To compare attach rate

About 1.3m but I will check agian.

Edit - http://www.gamesindustry.biz/articles/console-installed-base-almost-doubles-in-uk

Not unexpected. Halo is a very US centric franchise and has nowhere near the same clout in Europe. I expect the UK will be Halo 5s best market too.

While I'm sure it's likely more like 200k when you include digital, these are still (relatively) low numbers for Halo.