Fibonacci Fill - online puzzle game

overview

Fibonacci Fill is a number sequence logic puzzle. You are given multiple rows, each forming a generalized Fibonacci sequence. Some numbers are revealed as clues, and your job is to figure out the missing values. The core rule is simple: every number equals the sum of the two numbers immediately before it.

rules

• Each row is an independent Fibonacci-like sequence.
• Every number (from position 3 onward) must equal the sum of the two preceding numbers.
• Blue cells are fixed clues — you cannot change them.
• Fill all white dashed cells with the correct number to complete the puzzle.
• Each puzzle has exactly one valid solution.

controls

• Click/tap an empty cell to select it, then type a number.
• Press Tab or Enter to jump to the next empty cell.
• Use arrow keys to move between cells.
• Press Backspace or Delete to clear the current cell.
• Use Check to validate, Hint for help, or New Game for a fresh puzzle.

scoring

Your score is based on solving time, number of moves, and hints used. Fewer moves and no hints yield a higher score. Completing harder modes with larger grids earns bonus points.

tips

• If you know two consecutive numbers, you can calculate all subsequent ones by adding.
• If you know a number and the one two positions later, subtract to find the one in between.
• Start with rows that have the most clues — they're the easiest to solve.
• Use Check often to catch mistakes early before they cascade.

faq