Letterwork is a logic puzzle built on one idea: every letter is a number. A is 1, B is 2, and so on to Z is 26.

Each line on the board is an equation. You fill the empty squares with letter tiles so that every line works out — across addition, subtraction, multiplication, and division. Some squares belong to two lines at once, and those crossings are where the puzzle turns interesting: solving one line constrains another.

Every puzzle is generated on your device and has exactly one solution.

**No pressure, no habits to keep up**

There are no daily streaks, no timers, and no lives. Letterwork doesn't ask you to come back every day or punish you for stopping. Play one puzzle or a dozen, whenever you feel like it.

**One payment, and that's all**

The game is free to play, with ads and a limit on how many puzzles you can play. A single one-time purchase removes the ads and the limit, so you can play unlimited puzzles with no interruptions. There is no subscription and there are no coins or energy meters — you are never charged again.

**What's included**

• New puzzles generated on your device, each with one solution
• Two modes: a limited rack of tiles, or the full alphabet always available
• An optional no-hints mode for a harder challenge
• Harder modes that open up as you solve
• A short walkthrough that teaches the game the first time you play
• Light and dark themes
• Works offline
• One-time purchase to remove ads and play unlimited — no subscription

**How it works**

Each letter stands for its position in the alphabet (A = 1 … Z = 26). Drag tiles into the empty squares so every equation balances. You can look up any letter's value at any time. If you like crosswords, sudoku, or number puzzles, this will feel familiar and new at once.