Controls settings

Tools → Settings → Controls sets how strong the vibration is. Right and A step the highlighted row to its next value, and Left to the previous one.

Setting	Values	Default
Pad vibration	Off, Light, Medium, Strong	Light
Game rumble	Off, Light, Medium, Strong	Medium
Reset to defaults

Pad vibration

A short tick when you press the on-screen pad. A controller never makes the phone tick. It also follows Android's touch feedback setting: with that off, the pad stays silent whatever you pick here.

When it ticks: see Controls → Pad vibration.

Game rumble

The game's own rumble, on the controller you play with when it has a motor, else on the phone. Changing the level plays a short pulse at that strength, so you can feel it. Off plays none. In a multiplayer game it sets the strength for every player.

Which consoles rumble, and the Nintendo 64's Rumble Pak: see Controls → Game rumble.

Reset to defaults

Puts Pad vibration and Game rumble back to their defaults. It does not ask first.