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some game requires pressing same action button at same time.
but while I am pressing both triangle and square button
actually (q and w button addressed in lillypad)
but the game shows only one is pressing.and other button lighting when I keyup from the 1st button.

in conclusion
why both (or 3 or more) keyboard button doesnt supported pressing simultaneously yet?
albeit its avaible in winapi.

any idea ?

should I use a PC gamepad instead of keyboard ?

That seems a limitation of your keyboard, try setting the buttons you want to press to different ones on the keyboard.

Yes a gamepad would be much better for it.