Tick-tack-toe. The program implemented the traditional tick-tack-toe on the 3x3, three-dimensional tick-tack-toe on the 4x4x4 and four-dimensional tick-tack-toe on the board 4x4x4x4. The program provides several levels of difficulty. The user can enable / disable hints: the last move, a move to bring victory to the player / computer, and move to create a trap for the player. The user can cancel the previous move and return to a canceled move. One can save the game to a file. The program is available in two languages: Russian and English - switching between them is possible at runtime. The program contains the detailed documentation.