The game can be played with a timer - for pressure - or untimed.
Suppose the target # is 15. You have many options: look for a 7 & 8. There could be a 7, but where's the 8? Instead you find a 15 & 1 and make a multiplication operation.
The dial spins. I really like the graphics. In terms of a puzzle challenge, I think this is particularly good for kids. Although I could see seniors doing this to ward off Alzheimer's.
http://www.cardboardlemon.com/p/tinct.html
I am affiliated with Math Facts Game. The untimed option suggests a useful follow-on to the target-15 example: look for two different operations that reach the same target, when the available numbers permit it, then explain each choice. For example, 7 + 8 and 3 × 5 express different relationships even though both make 15. Comparing those alternatives could make the choice of operation part of the discussion, instead of recording only how quickly an answer was found. This is a practice-design suggestion, not a report of using Tinct.
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