Tutorial - 3x3 buttons

First is a video ([1]) explaining how the 3x3 buttons version works, also known as the level-4 of the challenge.

Below the video is the interactive interface with an explanatory side panel for you to experiment. It is also available full screen at this link.

More examples

One additional video is provided below ([1]). I am typing the code 1234.

What’s next

Next, I recommend inspecting the touch tutorial, in which you place points instead of clicking on buttons.

All available demos are linked below.

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Quick access: [Project page] [Crack it] [Try it] [Grasp it]