A bunch of us at Unplay are big LEGO fans and we've mentioned how we're focused on building the building blocks to empower narrative-driven role-play with LiveTale.
I just saw the announcement video for the new Sonic sets. As someone who used to build Hot Wheels tracks, I like the idea of the "Speed Sphere" and being able to daisy-chain the sets to build your own stage. I never got into the Mario sets, but might give these a try.