That's the Holmes edition. The rulebook was certainly (monochrome) blue, but the box cover was all sorts of colors. The dragon was red and the background was kind of blue-grey. I never called it "the blue box" myself, just Basic Set.
I suppose I should find the book and check MM there as well... or open another cold beer...
Decisions, decisions.
[From Supplement I GREYHAWK 9th printing, May 1978-page 22]
Magic Missile: This is a conjured missile equivalent to a magic arrow, and it does
full damage (2-7 points) to any creature it strikes. For every five levels the magic-user has
attained he may add an additional two missiles when employing this spell, so a 6th level
magic-user may cast three magic missiles at his target, an 11th level magic-user casts
five, and so-on. Range 15".
[END TEXT]
[From Holmes Basic 3rd Edition December 1979 -page 15]
Magic Missile-Level 1; Range: 150 feet
A conjured missile equal to a magic arrow, and it does 1 die roll plus 1 point (2-7) to any creature it strikes. Roll the missile fire like a long bow arrow (
Missile Fire Table). Higher level magic-users fire more than one missile.
[END TEXT]
[ From Moldvay Basic First Printing-January, 1981- page B16]
Magic Missile Range: 150'
Duration: 1 turn
A magic missile is a glowing arrow, created and shot by magic,which does 2-7 (1d6+1) points of damage to any creature it strikes. It will automatically hit any visible target. For every 5 levels the caster has gained,he or shee may shoot two more missiles when casting the spell. EXAMPLE: a 6th level magic-user may cast three missiles. These may be shot at one target,or the caster may choose to cast the missiles at different targets.
[END TEXT]
Interestingly, the original presentation of magic missile was not explicit on the matter of requiring a to-hit roll. The Holmes rules were quite clear that such a roll was required and the Moldvay rules were quite clear that a roll was not required. You could interpret a logical reasoning for either treatment based on the original description.
Also note the duration of the Moldvay version. We interpreted that and played it so that a caster could summon the missiles then discharge them as desired over the course of the combat provided that the action lasted less than a full turn of course.
