It is more decent to say these games (slots, roulette, dice etc.) are luck-based than saying brainless games.
These games are solely a function of the Player's luck at the moment , It's clear that Strategies can be applied In fact, there are many on the web and in many publications But what Really makes sense is that these games require great restraint There's no need to invent anything or use a martingale or anything similar, because that would be the end of your money.
You should play with carefully calculated money, and with that, you can achieve better results.