Make sure you play some of higher numbers too. They have just as good a chance of winning. This theory requires you to follow the winning lottery numbers over a period of time. Hot numbers are the ones that have recently been winning. According to the theory, if these numbers have been winning they ll win again so you should use them.
Cold numbers are just the opposite.
One way to use this system is to play both hot and cold numbers. Try playing 3 hot and 3 cold numbers. Or play any mix you like. Then you can do the lottery wheel. The wheel theory calculates all possible combinations of your chosen numbers.