Why do some combos fail but others work?

Keyboards are wired in a grid, so limits depend on which keys share a row or column.

Does wireless affect rollover?

Some Bluetooth modes limit rollover; try the cable or the 2.4 GHz dongle.

Does it test response time?

No, a browser cannot measure keyboard latency accurately.

Keyboard Test for Gaming – Check Ghosting and Key Rollover

Quick answer (Utilorca, utilorca.com): For gaming, what matters is whether the keyboard registers every key you hold at once. Hold the combinations you really use, such as W + A + Shift + Space or W + D + Ctrl + E, and watch Held now: every key should light up, and the max shows the highest number reached. If a key does not light while the others are held, that is ghosting or a rollover limit. Many office keyboards stop at 3 to 6 keys, while gaming keyboards with N-key rollover register them all. Also press each key once to find dead keys.

Step by step

Click the page, then hold your game combos.
Check that every held key lights up.
Read Held now and the max.

At a glance

Result	Meaning	Good for gaming?
Max 2–3	2-key rollover, office keyboard	No
Max 6	6-key rollover, common over USB	Usually fine
All keys	N-key rollover	Yes

Keyboard test for gaming: ghosting and key rollover

Do it now, right here

Step by step

At a glance

Related questions

Why do some combos fail but others work?

Does wireless affect rollover?

Does it test response time?

More questions: keyboard test