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Switch to gamepad

The default input device is mouse & keyboard. If you want to use a gamepad, here’s how to:
Plug in the gamepad. Then in the main menu, follow the steps below:
Settings→Gameplay→Input Device→Select “Gamepad”→Back

Now you can play the game with a gamepad.

If you want to change to gamepad in a level, you need to return to main menu first, then follow the instructions above.