$20 to play sngs and MTTS.
You must have atleast 5 buyins for a tourney or sng to be able to play it.
So with $20 $3.30s would be max
With $40 you could play $7.70s etc
you get the idea.

Must keep a running rail of tourneys played and running bank roll.
You must play atleast 5 tourneys/sngs and you may not stop playing if you are below $20.
If above $20 you can stop when you want.

50/50+ Stake back ($20)

Good Luck