Drag and drop the Greek letters in the grid so that each letter appears exactly once in each row, column and main diagonals. This game is updated 4 times a day: 00:00, 12:00, 16:00, and 20:00.

- Drag and drop the letters in the empty cells so that each row, column and main diagonal contains the given (blue background) Greek letters without repetitions;
- Each grid starts with the first row and some other cells already filled;
- Playing:
- Drag a given Greek letter (blue background) and drop it to an empty cell;
- Click on a letter that you placed to remove it from the grid.
- If there's a logical error (repeated letters in the same row, column or main diagonal), a red border will appear on the misplaced cells;
- The game ends when all the cells are correctly filled;
- Each game is solvable using logic only, i.e., guessing is not needed;
- The difficulty level changes the size of the grid and the kind of logical strategies needed to solve them.

- If this is your first time playing, choose the "Very Easy" grid so that you can understand the rules clearly;
- Start by looking at the grid and observing which letter appears more often. It's very likely that you'll use it right away;
- Logic strategies such as "Naked Pairs" and "Hidden Pairs", that are usually needed to solve Sudoku puzzles, can also be used on this game (see our Sudoku Guide).

To make the game more interesting, we used some letters from the Greek alphabet. The letters we chose are: Δ (Delta), Θ (Theta), Λ (Lambda), Ξ (Csi), Π (Pi), Σ (Sigma), Φ (Phi), Ψ (Psi) and Ω (Omega).

This puzzle was originally created by the Russian Leonid Mochalov.

Playing "Greek Logic" engages multiple cognitive functions, including problem-solving, pattern recognition, and spatial reasoning. The game's requirement to fill in rows, columns, and diagonals with unique Greek letters challenges players to think logically and plan several steps ahead. These skills are not only vital for the game itself but also have broader applications in everyday decision-making and tasks that require strategic planning.

Additionally, "Greek Logic" demands focused attention and quick error identification, which can help improve cognitive flexibility and adaptability. When a logical error occurs, players need to quickly identify and correct it, refining their ability to adapt strategies on the go. Over time, these cognitive exercises can potentially lead to better memory, faster information processing, and an overall increase in mental agility.

The structured yet challenging nature of "Greek Logic" makes it an excellent tool for educational settings. Its rule-based gameplay aligns well with curricular objectives in mathematics and logic, teaching students how to approach problems methodically and arrive at solutions using deductive reasoning. Students can also learn valuable skills like pattern recognition and strategic planning, which are useful not just in academic contexts but also in life situations that require logical thinking.

Incorporating "Greek Logic" into the classroom offers a way to make learning interactive and engaging. Teachers can use the game as an educational aid to complement lessons on logic, mathematics, or even Greek alphabets. The varying levels of difficulty allow for differentiated instruction, catering to students with different skill sets and learning paces. Overall, the game offers a unique and effective way to cultivate logical reasoning and problem-solving skills, making it a worthwhile addition to any educational toolkit.