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Controller
These settings apply in the browser and in the Windows and macOS builds alike.
25%
Controls
D-pad / stick
Move between cards and buttons
A
Select
B
Back / cancel
LB / RB
Jump between zones (hand, field, piles)
X
Next phase during a match
Y
Match log
Right stick
Scroll the page
Start
These settings
Those are the positions the game currently believes in. If they are wrong, or your controller prints something else on them, calibrate it: press each control once and say what it says.
TV remote
Arrows
Move between cards and buttons
OK
Select — a card opens with its available actions
Back
Cancel the current step, then leave the page
The whole game is playable with these six keys alone. On a computer the arrow keys, Enter and Escape behave exactly like a remote.