I'm hoping this idea will pan out. Basically, post here when you wish to start a match. I suppose if you're reading the latest post in this thread thirty minutes later, gameplay will have ended.

Does this make any sense? Right now I'm sitting in Invite Friends > Standard (4 player with items) > lobby, waiting for people to join. If no one joins in 30 minutes, I'll turn off my DS.
My profile
Some quick info.: My Tetris DS Friend Code is 059726/798063. Feel free to add me to your Friends Roster.
If you want to do the same, just post here that you're waiting (and your friend code, if it's not in your Gaia profile.)

Good idea? Bad idea? Already been done?