Nine Rings

This minigame was part of the Dragon Festival.

Rules
Nine rings are organized in a 3 x 3 layout in which contestants may stand and costs ten tickets each round. Every five seconds, any player standing in a ring pays the ten ticket fee. One ring is randomly chosen as the winner. Standing in that ring awards anyone standing in the ring 25 tickets if the center, 40 if on the side, or 55 if it is in a corner. Standing in an adjacent ring awards fifteen tickets.

Odds
This odds of this game will return 17 for every 18 tickets spent.

9 x -10 = -90 cost center: 4 x 15 + 25 = 85 win side:  3 x 15 + 40 = 85 win corner: 2 x 15 + 55 = 85 win

You gain on average 9.4 tickets per round no matter what square you are on, and you always loose 10.