there is another version - you use the "bonus" money the house gives you for signing up & bet 1 credit on each number every spin & lose 2 or 3 credits each spin (numbers pay 35:1 dont they ?) as there is 37 number or something - the earner is the fact that you cant withdraw the house bonus cash until you have bet something like 8 times that whole sign up deposit, but if you only lose 2 credits or dollars a spin you use up the required bets & still get to withdraw most of the bonus after 40 or 80 spins or something ! - sounds convoluted but it made me 90 dollars for 25mins work! (unfortunately it only works once for each different casino)
you must read the rules about claiming withdraws as some casinos insist on betting 8 or 16 times the initial deposit & bonus !!

there is another one that has to be done at 1 player only betting shop websites that use certain types of program - still trying to work that one out properly - its something to do with these more basic games cannot generate a truely random number
i'll work that one out one day!!