NetEnt is a regulated company that adheres to strict rules regarding how games are operated in a fair and honest manner. Their random number generators are tested by independent third parties to ensure that players are not defrauded in any way. This means that there is no obvious way to always win when playing their games. If there had been, both the devloper and the casinos would go bankrupt very quickly. There are ways in which players can increase their chances of winning, however.
Casino games can have different Return to Player (RTP) percentages (or “payout ratios”), which is a number that says how much of all wagered money is paid out as winnings on average over millions of bets. If you play on a slot with a high payout, you increase your chances of winning overall. The developers slot with the highest RTP is Mega Joker, at 99%.
Progressive jackpot slots normally have a lower payout for example, as a portion of all bets goes to the jackpot. However, if you do win, you win a lot. Some players prefer winning a little but often, while others want a chance to become a millionaire in a few spins.
Remember to gamble responsibly.