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Great point; I was hoping my per-action cost to be around $0.09, which is roughly 10 times FreeRice's (pre-increase) cost of 10 grains, since it takes awhile to solve a sudoku puzzle.

Do you have any ideas on what would be a good single click or trivial action? I don't want to copy FreeRice outright, but I am having trouble brainstorming for other activities for the user. Perhaps a quiz about water cleanliness?

Thanks for the feedback!

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You could do something with high/low to bet if a water temp is going to be hotter or colder than a starting temp if you wanted to make it a game of chance. You could do something as basic as rock/paper/scissors, or tic tac toe. Pick n games that are that simple, simplify your sodoku to 1/9th the size, do multivariate / a/b testing to see how the CTR is for each game and let the traffic/users decide.

FreeRice is also nice because the domain is short =) although it looks like free/clean water/h2o variations are squatted (as far as instantdomainsearch.com knows) - good luck!

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