[For casual enjoyment of Doku, you will not need most of what follows. However, as you progress, you may find answers to the questions that occur to you (such as a hidden function to reduce repetitive maneuvers or a feature for power players).]

Doku ciphers* come in six levels: [White - Yellow - Blue - Red - Black - D17] Most ciphers are generated on the fly, so you always have a unique and fresh challenge. As you progress, you acquire different visual skins. Depending on your cognitive profile, you may find the one that works best for you. Master them all if you can.

If you didn't finish the Basic Help, check out Basics for the rules and input methods of Doku.

Check out Duel and Stats sections and find out how to play competitive/social Doku with fellow players. If you prefer to be solitary, you may focus instead on improving your average speed at each level. Even the easiest level poses a worthy challenge: Try and become the first to break the minute barrier.

For more difficult levels (Blue and above), master the shortcuts and other functions in Hints and Memo.

You have been briefed about what's going on when you started. Find more about it through FAQ. Your continued engagement with Doku ciphers will assist us with our super-secret next project. We appreciate your help.

Good Luck!

* From Oxford Dictionary of English
Cypher/cipher
a secret or disguised way of writing; a code; from Old French cifre, based on Arabic ṣifr 'zero'