I've played several of the Hubbles tournaments at Poker Stars.
I forget exactly what they are, but I think it's a Round 1 of 3 towards a big cash tornament, if you make it to round 3.
I've made it to Round 2 a couple times where the prize pool is $2,000 or so, but never made it to the money tables.
If I had had more time in the last 2nd Round tournament I played, I could have placed in the money.
It was getting late, I was tired, and just gave up after a couple hours of playing.
So, if you make it to a Round 2 seat in a Hubbles tournament, you get to play for the real cash.
If you make it in the top 10 (I think) in a Round 2 tourney, you go on to a larger cash tournament.