3Doku presents full 9X9 Sudoku puzzles on each face of a virtual cube where adjacent faces share common edges. The linking between faces adds a new dimension of complexity for users beyond the standard 2-D puzzles.

The interface provides an easy-to-use number pad color-coded faces separate progress bars for each face and an UNDO button.

The 3Doku app comes with an initial set of 1500 puzzles on each of five tiers of difficulty. That's a total of 45000 puzzle faces.

Higher tiers of difficulty are unlocked by completing at least one puzzle in the next lower tier.

Users can accumulate experience points to unlock image features to replace the standard 1-9 digits. Images may also be unlocked by utilizing tokens. The initial distribution comes with 100 tokens.

In-app tokens can be used to unlock features and to get assistance such as removing all the errors or getting some additional values. Tokens are not required for normal usage. Additional tokens can be acquired through in-app purchases.