If you could buy one title that you can lock in a time capsule to sell in 30 years time, what would it be?

A massive classic like Half-Life 2? A small release with amazing reviews like Shadow of the Colossus? A game will little to no sales, as it will be rare as rocking horse poo?

I guess I'd grab Electroplankton. It's small distrobution method on the net is likely to make it rare in future, plus single developer's games (like Seaman) are always sought after.

So, start deciding, and maybe we'll dig this thread up in 30 years, and see who would have made the most earthros (you see, other lifeforms will be discovered on distant planets, so we just have a currency for the whole of Earth ) :P