With the latest update, a new UI has been introduced for the Slots. Currently this is only available in Penguin Pengwin and Lucky 7's Classic, but we'll be seeing this change applied to all of the Slots very soon.
Here is an example of the new UI we'll be seeing:
There is no longer a separate auto spin option. Instead, players will just need to click, and hold, the Spin button, and this will begin the auto spin. This option will no longer ask for how many spins to complete and will instead continue until Stop is clicked, or until the maximum 10,000 spins have completed.
The auto spin button will now show how many spins have been completed. If the auto spin stops while a player is away from their keyboard, there will now be a pop-up showing how many spins were completed.
With the update, there is now the option to enable faster auto spin. Players can do this by clicking on the Pay Table:
By checking the box, faster auto spins will be enabled.
Please note: This setting is universal, so once enabled, it will apply to all of the Slots with this update.