You can make the game score based. The final score will be inversely proportionate to the time it took to finish the puzzle (which will make the player want to solve it faster) AND proportionate to how closely they've predicted the time it will take them to solve the puzzle. (Solving under the predicted time will give the maximum score for the predicted time, since the player can just wait anyway.)
Example: I guess 10 minutes, solve the puzzle in 8 minutes -> I get score for 10 minutes. Example: I guess 7 minutes, solve the puzzle in 8 minutes -> I get score for 8 minutes - 1 minute penalty.
That works - though there should be a penalty for guessing overtime too - otherwise I'd always just guess 9999 minutes :)
We need some ideas for serious games. Games that will help us be better. Games that reward us for improving ourselves (even if just by the satisfaction of seeing our scores improve). Games that will help us in our quest of Tsoyoku Naritai
We've got an upcoming hackday in London - where we'll have a (small) bunch of people able to code up any good ideas into something usable... but we need **you** to help us come up with a whole bunch of good ideas.
To start with, they should be simple ideas - not as complex as Rationalist Clue (which is an awesome idea... but we all have dayjobs too). I've got in mind something like the kinds of games you see at luminosity
The ideas should address individual biases - a way of training us to: a) recognise when we've accidentally engaged a bias b) reward us when we find a way to get the "right answer" in an unbiased manner.
We can do the programming (more help would of course be welcome), we can even come up with some ideas of our own...
but we are few, and you are many... and the more ideas we get, the better we can choose between them... so let's roll.