[Zingela]

Promotional keychains that were attached to Coca-Cola bottles in Japan around Sonic Advance 3's release:



Contained one of six key chains, each posed like the artwork pictured. Also has a small leaflet inside the packaging advertising Sonic Advance 3 and Puyo Puyo Fever's releases.

[Jen]

Ah! I bought one of those Tails keyrings off eBay many years ago, without any packaging. All the information in the auction said was basically "it's from Japan". I've never seen another one for sale since then, and always wondered where it'd come from - so now I know! I'm really happy you posted that, Zingela :D

EDIT: And here's a (horribly low quality from my phone) photo of it:

[Blades]

There was a fitting tie in from Reebok when they were promoting their DMX shoes. It was a downloadable competition for Sonic Adventure.

[Jen]

I got this postcard off eBay a few days ago. I've never seen one before and have no idea where it's originally from. It's clearly advertising, but it's really nice. Can anyone shed any light on it?