“Swapnote RPG” by Ben Gray. Emergent gameplay is emerging! Using a series of text notes for gameplay text and the “graph paper” stationery for maps, Gray made a D&D style RPG playable entirely in Swapnote.
I basically like everything about this… I especially like the asynchronous nature. It’s like Words With Friends: The RPG. I’d imagine your Swapnote inbox would get full really quickly doing something like this, though.
See also: More Swapnote news