Pinball is two buttons, a plunger and a shove. Here is where each of them is on a keyboard, on a phone and in a headset.
How long you hold the plunger is how hard the ball is launched, and this is the one control that surprises people. A tap fires the weakest shot in the game — on many machines the lane awards are only collectable in a narrow band near the top of the range, so a player who taps every ball is locked out of a scoring feature without ever being told.
On a keyboard, hold the space bar and let go. On a phone, drag the plunger down and release. In a headset, take hold of the rod and pull it back.
Left and right, and they are independent — a good player uses them separately far more than together. On a keyboard they are the left and right shift keys. On a phone, the lower left and lower right of the screen. In a headset, the buttons on the sides of the cabinet, pressed with your hands.
A shove moves the whole machine, which moves the ball. It is what saves a ball heading for an outlane. On a keyboard the arrow keys nudge; on a phone a flick does, and you can turn off the device-motion half if you cannot move the phone; in a headset you push the cabinet with an open hand.
Nudge too much and the machine tilts, which ends the ball and takes its bonus. That is not a bug — it is the rule every real machine has, and learning where the line is is part of the game.
How many balls a game gives you is the machine’s decision, and it is stated on the machine. When they are gone, the game is over and the score stands; if it is a good one, the machine asks for your initials.
On a Quest 3 the machine is a full-size cabinet in your room, and you stand at it. The browser can enter VR directly; there is also a native application. Either way you can play seated, and the comfort settings are there to be used rather than to be found later.