This strategy can theoretically also be applied to roulette, but fails in reality because you do not have an infinite amount of money and the stakes are also capped. Thus, there are no strategies with which you can surely win – but you can still maximize your probability of winning. The most promising strategies are aggressive ones, where you always bet as much as possible. As an example, let's take the so-called »Red and Black« game, where you bet either on black or on red: Let's say we have a fortune of ten euros at the beginning and we want to leave the roulette table with 100 euros at the end. A best strategy is to bet as much on the desired color as you have to, so that if you win, you have 100 euros. If you don't have that much money, you bet everything you have. Concretely: If you have 20 euros, then you bet these. If you have 60 euros, then you bet 40 euros as this much is needed to reach the desired 100 euros. This strategy seems risky at first sight, because you can lose everything very quickly. On the other hand, you have to realize that in the long run the game always goes against you – that's the law of large numbers. Thus, you should keep the stay at the table as short as possible, because in the short-term larger fluctuations are possible in your favor.
Beyond that, almost only illegal tricks remain in the casino, such as secretly shifting. Or other, forbidden manipulations of the dice or roulette wheels. Also watching the games closely to learn something from the hand movements of the dealers and the wheel positions is rather futile. It will probably take more observation time (and thus lost money) than the casino will give you before they ask you to leave.
In Lotto, you can play with system by tipping on a series of numbers that are rarely tapped by their peers. Most people prefer patterns or dates. Numbers above 31 are thus relatively seldom picked. This does not increase the probability of winning, but in this case, you will probably have to share with fewer other winners. The fewer people play lotto with a system, the better it is for the system players. Unfortunately, even in this variant there remains an expected loss for you, because now the company for system tipping is interposed and also wants to earn something. To your disadvantage of course.