daily_double, I was able to count everything down in this youtube video of Wild Mermaid. It's a classic example of a banking game. This is what I was able to deduce from the video. The player started with $100 in credits. He was making the max bet of $2.50. It took him 61 spins to collect the 20 tiles. He had $47 in credits left when he was awarded the free games. He wound up getting 12 free games that returned $21.25. 1. The 61 spins at $2.50 means a total wager of $152.50. 2. Since he had $47 left when he was awarded the free games that means he got dropped for $53. 3. $53 divided by $152.50 means he got dropped for 34.75%. 4. $53 divided by 20 tiles means his average cost to catch a tile was 1.06 bets (2.65/2.50) 5. He wound up getting 12 free games and collected $21.25 from those free games. 6. $21.25 divided by 12 games means the average free game was worth .71 bets (1.77/2.50) 7. So he lost $31.75 which means a return of 79.2% This is a very small sample space but it's a sure fire bet that the game has a higher return than 79.2%. I would want to collect statistics on this game to determine how many tiles I need to find to make it positive expectation to spin it off. I'm going to collect stats on every play. I carry a small pocket notebook for recording stuff like this. On every play I'm going to write down: 1. At the beginning of every play I'm going to write down how many tiles are left to go. 2. I'm going to count and record the number of spins it takes to collect the rest of the tiles. 3. I'm also going to record the amount of money I got dropped for to collect the rest of the tiles. 4. I'm going to count and record the number of free games I get. 5. I'm going to record the amount of money I won in the free games. The sample space will grow with every play I get. I'm going to average everything out as the sample space grows. I want to know what the average cost to catch one tile is. What is the average free game worth? What is the average number of free games per play. In the end the statistics will tell me how many tiles I have to find banked to make it a positive expectation play. I would be willing to invest a little money in losing plays just to get those stats. But I would only do that on the fifty cent bet level.