... the Famicom Disk System version of Ice Climber.
Why did I buy yet another version of this classic, confounding game? Because this version differs from the Famicom/NES version in a number of ways. (The main ones: It includes all-new stages that don't appear in its cartridge-based counterpart, some of which feature weather effects that make the game even more challenging than it was originally.)
Another reason I bought this version: The banana-yellow disk seen in the photo above. (One or two more photos of the game can be seen in my Flickr photostream.) Oh, and it was less than $10.
See also: Previous '12 Games of Christmas' posts