Scratch cards are common in countries that also have lotteries. They’re games of pure chance, as every batch of cards will have a predetermined number of winners. Payouts are based on matching numbers and symbols, and the player’s only input is scratching off the coating to reveal the symbols, hoping for a match.
Roulette is a game that relies on luck, especially when played in digital versions at mobile and online casinos. A random number generator offers no exploitable biases to observant punters, the way physical wheels and croupier habits do.