To best answer that, it’s key to know what lock and roll slots are. Lock and roll slots are skill-based slot machines which you can find in various jurisdictions. These games look like any ordinary slot machine, though are played more or less like video poker. They also follow very specific rules unlike traditional slots. For example, you have the option to hold reels in places (hence the lock) and you’re allowed to re-spin the others (hence the roll). Because of this unique nature, these slots are available in certain locations. Examples are Ontario casinos and casinos in North Carolina.