If you are using an iPhone or iPad, your screen will Auto-Lock after a set amount of time while playing ... instructions to navigate the TARDIS through the vortex. On desktop you can use a mouse.

For the first time, the Doctor identifies the realm through which the TARDIS travels as being the ‘vortex’, a term that would be regularly used throughout the rest of the series. It’s also ...

The Doctor uses a whistle to control his own TARDIS, firing a laser that destroys Sutekh's herald, Harriet Arbinger. He then ties Sutekh to the console and drags him into the time vortex.