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How to play decodle21!
In decodle21 you have 21 moves to put all the digits in the correct place and make all the tiles turn green. Each row or column of 5 digits must add up to 21.
decodle21 instructions
Analyse the grid
Before making your first move in decodle21, analyse the grid to eliminate and deduce possible numbers for each row or column. Your strategy begins here - before the timer starts running with your first move.
Strategies for success
Each grid has a perfect solution of max 12 moves. As you progress through the game, remember that there are three main strategies to help you succeed.
Maximise the information gained with each move.
Memorise the information you have already gained.
Avoid placing digits in places you know they don‘t belong.
Use the hints
Our practical hints button shows you what the correctly placed digits in each row and column add up to. Use this information to rule out further digits from some rows or columns.
How to play decodle21!
Make every row/column sum up to 21 in just 21 moves.
Swap per click or drag&drop.