The Arctosa features anti-ghosting around the gaming cluster; w,a,s and d.

If you try to push any 2 of those buttons you should be able to push a third without a problem. (from my tests you can also push a fourth key in most instances if 2 of the keys are either w,a,s or d)

A keyboard's circuitry is arranged in matrixes around the keys. Depending what 2 keys you hold down at once, the 3rd key may or may not work. Because different keyboards often use different circuitry, the keys you can press at the same time will vary from keyboard to keyboard.

Хрена, у меня кажися Арктроза. У меня 8 одновременно можно жать нихрена не будет я 10 жал нормально, больше пальцев не было.

The anti-ghosting feature is available on the WASD keys. So if you press E + F + Space +Tab then we can't guarantee you won't have issues as none of these keys are WASD keys. I don't believe there is a way to set the anti-ghosting feature to other keys.

что мешает в магазине попросить поробывать понажимать

You can toggle the Gaming Mode ON/OFF by pressing the “Razer Logo” button together with one of the Windows buttons. When this key combination is pressed, both Windows buttons are disabled. To reactivate the Windows buttons, press the “Razer Logo” button together with one of the Windows buttons again.