I've been looking around for some on-line games which allow me (and my students of course!) to behave mathematically without being obviously mathematical (ie they're not about doing sums or solving equations - more about the sudoku type of maths skills).
I guess I'm thinking of the process skills as given in the new curriculum and ways that I can put my students in situations where they are naturally using these skills - particularly if they're working in pairs on the same game and have to discuss what the next move should be.
The games I'm liking so far are
A Japanese Tetris style game (with exceptionally irritating music. The aim is to survive for as long as possible. If you get three of the same symbols in a row on your pointy stick then they disappear)
A frog hopping game
The lightbulb puzzle
It's worth noting that some of these won't work in school because of the filtering
Any thoughts on the mathematics used or pointers to other such games would be very much appreciated.
Oh - and be careful, it's possible to lose hours of free time to these things!