At first I thought an A-Z game couldn't survive in a spot about one game, but then I realized that Super Smash Bros. Brawl has loads of content - stickers, trophies, Subspace Emissary features - that could support a game like this.
The rules are simple. The first person starts with something related to Super Smash Bros. Brawl that starts with the letter A. The second person says something that starts with B. Et cetera. You can't go twice in a row unless a week goes by without another response.
A - Auroros. Those annoying bird things that swoop down on you in the Subspace Emissary.