You took 0 so I took 0. Ok, there's 30 marbles left, and you could take up to 3.
There's a pot in the middle of the table full of marbles. we take it in turns to take a few, you go first. The objective is to take the last few and leave just 1 marble in the pot. There is a knack, but one slip.... so you have to work at this one.
Slot machinePlay It!
Sudocu - 5 scales!
Right, so these are for a little amusement, i'll add more if there's demand or I get some good suggestions or brainwaves for that matter; so enjoy! Randex Webmin.