We haven't taken an exact tally, but according to Kotaku, this is one fan's collection of every (physically released) Mega Man game, all together at once. Well, Rockman, technically; we don't see anything with the Western version of the brand in the pile.
Heck, there are even what appear to be some arcade boards in there!
How does your collection compare? We have to confess; our own collections are probably shy by one or two of these.
Thanks for the tip, Riot.EXE!