Ready to build a logic puzzle
Type your theme in the AI Generator panel on the left, copy the prompt to your AI tool, then paste the response back. The puzzle renders here.
Find AI Generator in the left panel
How to Use Logic Puzzle Forge
Welcome to Logic Puzzle Forge
This app builds print-ready logic grid puzzles from a single theme. The AI gives you the categories and items, and the app generates the actual puzzle with mathematically verified unique solutions.
The key promise: every puzzle the app gives you is guaranteed to have exactly one solution. The validator runs a brute-force solver before showing you anything.
What you can do here
- Generate a logic puzzle from a theme (your idea or a random one)
- Choose from 9 visual layouts and 10 color themes
- Customize every element: fonts, sizes, colors, spacing, borders, backgrounds
- Save your favorite styles as reusable profiles
- Export as print-ready PDF or high-resolution PNG
- Include a solving tips page and a full solution page
Three-panel layout
The app uses three panels. The left panel handles content and design choices. The center shows your puzzle. The right panel handles export, page setup, and surface styling. Click any section header to expand or collapse it.
Building a puzzle from scratch
The app uses a two-step process. You provide a theme; the AI gives you categories and items; the app generates the actual logic itself. This is how we guarantee unique solutions.
1
In the AI Generator section (top of left panel), type your theme. Example: "Five astronauts heading to different planets". Or leave it empty for a random theme.
2
Set the number of categories (3-5) and items per category (4-6). Default is 4×5 which produces a satisfying puzzle in seconds.
3
Click Generate with AI. The prompt copies to your clipboard automatically.
4
Open ChatGPT, Claude, or DeepSeek. Paste the prompt. Run it. The AI returns a small JSON block.
5
Paste the AI's full response back into the modal's text area. Click Build Puzzle.
The app validates the puzzle. If it cannot prove a unique solution, it retries up to 40 times. You will never see a broken puzzle.
Difficulty levels
Easy: mostly direct "X is Y" clues. Good for kids or warm-ups. Medium: balanced mix of direct, negative, and ordering clues. Hard: minimal direct clues, more inference required.
Pick a layout
The Layout Style section gives you 9 design templates: Classic, Split, Storybook, Poster, Minimal, Kids, Workbook, Tabloid, Zen. Each layout has its own font defaults and visual personality.
Per-element styling
The Per-Element Style section lets you customize every text element on the page independently: title, subtitle, instructions, clues heading, clues list, grid heading, grid labels, footer, solution title, and solution table. Each one has its own font, size, color, weight, and alignment.
Use Apply to All at the top of that section to set every element to the same font and color at once.
Color themes
The Color Theme section in the right panel offers 10 presets (Ink, Royal, Forest, Sunset, Berry, Ocean, Coffee, Slate, Vintage, Plum) and a custom color picker. The selected color tints the title, headings, and decorative elements.
Page setup
The Page Controls section sets page size (US Letter, Square, A4), layout style, theme color, what gets shown on the page, page mode (all on one page or clues separate), and whether to include a solving tips page.
Save your style
The Saved Profiles section stores every design choice as a named preset. Save your favorite combination once, then reapply it to any future puzzle with one click.
Two formats, both print-ready
The Download section in the right panel offers two export formats:
- Print-Ready PDF: single multi-page document. Best for direct printing or KDP upload. Each page exports at 300 DPI.
- PNG Pages (ZIP): individual PNG files in a ZIP, one per page. Best for editing in another app or uploading to Etsy.
PNG sizes
Small (1×) is good for previews. Medium (2×) works for screen sharing. Large (3×) is the standard for printing. Ultra (4×) is for high-detail prints or downstream editing.
Page sizes
Switch between US Letter (8.5×11"), Square (11×11", common for KDP), and A4 (210×297mm) in the Page Controls section. The page redraws instantly.
What gets exported
By default the export includes the puzzle page plus a solution page. Enable the Solving Tips Page toggle to add an instructional page in front. Toggle Clues Separate in Page Mode to split the puzzle across two pages (board only, clues only).
How to solve a logic grid puzzle: a real example
Below is a complete 4×5 logic puzzle: five teachers, each with a different favorite stall number, favorite color, and favorite drink. I will walk you through every deduction needed to solve it. The same technique works for any puzzle the app generates.
Print this image and follow along. Read each clue carefully, then read the matching step below. Every deduction is justified by a specific clue. Nothing is guessed.
The categories
- Teachers: MsAllen, MsBao, MsChen, MsDiaz, MsEom
- Stall numbers: 1, 2, 3, 4, 5
- Colors: Red, Blue, Green, Yellow, Purple
- Drinks: Tea, Coffee, Water, Juice, Soda
How to mark the grid
Every cell in the grid is either blank (you do not know yet), a green circle (this pair is the answer), or a red X (this pair is impossible). Every time you place a green circle in any sub-grid, immediately X out the rest of that row AND the rest of that column. One match means the rest cannot match. This rule is the engine that drives the whole solve.
1Place the direct positives
Look for clues that say "X is Y" or "X is paired with Y". These go straight on the grid.
Clue 1: MsDiaz is 5. Place a circle in MsDiaz × 5. X out the rest of MsDiaz row and stall 5 column.
Clue 6: MsChen is 3. Place a circle in MsChen × 3. X out the rest.
Clue 5: Red is 3. Place a circle in Red × 3.
Clue 2: Yellow is 5. Place a circle in Yellow × 5.
Clue 4: Juice is 4. Place a circle in Juice × 4.
Clue 6: MsChen is 3. Place a circle in MsChen × 3. X out the rest.
Clue 5: Red is 3. Place a circle in Red × 3.
Clue 2: Yellow is 5. Place a circle in Yellow × 5.
Clue 4: Juice is 4. Place a circle in Juice × 4.
2Chain to link categories
This is the most powerful technique. When two clues share a common item, you can combine them.
Clue 6 says MsChen is 3. Clue 5 says Red is 3. If MsChen is at stall 3, and Red is at stall 3, then MsChen is paired with Red. Place a circle in MsChen × Red. X out the rest of MsChen row and Red column.
Clue 1 says MsDiaz is 5. Clue 2 says Yellow is 5. By the same logic, MsDiaz is paired with Yellow. Place a circle in MsDiaz × Yellow.
Clue 9 says Yellow is paired with Water. Since MsDiaz is Yellow, MsDiaz drinks Water. Place a circle in MsDiaz × Water.
Clue 1 says MsDiaz is 5. Clue 2 says Yellow is 5. By the same logic, MsDiaz is paired with Yellow. Place a circle in MsDiaz × Yellow.
Clue 9 says Yellow is paired with Water. Since MsDiaz is Yellow, MsDiaz drinks Water. Place a circle in MsDiaz × Water.
3Apply the remaining direct positive
Clue 7: MsBao is paired with Purple. Place a circle in MsBao × Purple. X out the rest of MsBao row and Purple column.
Now the Teacher × Color sub-grid looks like this: MsChen=Red, MsDiaz=Yellow, MsBao=Purple. MsAllen and MsEom must take Blue and Green in some order.
4Apply the negatives
Clue 8: MsAllen is not paired with Green. Place an X in MsAllen × Green.
This forces a deduction. MsAllen can only be Blue or Green (the other three colors are taken). Since MsAllen ≠ Green, MsAllen is Blue. Place a circle in MsAllen × Blue. That leaves MsEom = Green.
5Chain again with the new info
Clue 3: Blue is paired with Coffee. Since MsAllen is Blue, MsAllen drinks Coffee. Place a circle in MsAllen × Coffee.
6Solve the stall numbers
So far we have stall numbers: MsChen=3, MsDiaz=5. MsAllen, MsBao, and MsEom share stalls 1, 2, and 4.
Apply the negatives that touch this:
- Clue 10: MsBao is not 4 → X in MsBao × 4.
- Clue 11: MsAllen is not 2 → X in MsAllen × 2.
Now think about clue 4 again. Juice is at stall 4. MsAllen drinks Coffee (we just established that), so MsAllen is not at stall 4. Place an X in MsAllen × 4.
MsAllen cannot be at stall 2 (clue 11) or stall 4 (just deduced). Stalls 3 and 5 are taken by MsChen and MsDiaz. So MsAllen is at stall 1.
MsBao cannot be at stall 4 (clue 10). Stall 1 is now MsAllen's. Stalls 3 and 5 are taken. So MsBao is at stall 2, which forces MsEom to stall 4.
MsBao cannot be at stall 4 (clue 10). Stall 1 is now MsAllen's. Stalls 3 and 5 are taken. So MsBao is at stall 2, which forces MsEom to stall 4.
7Finish the drinks
MsEom is at stall 4. Clue 4 says stall 4 is paired with Juice. So MsEom drinks Juice.
Drinks so far: MsAllen=Coffee, MsDiaz=Water, MsEom=Juice. MsBao and MsChen share Tea and Soda.
Clue 12: MsChen is not paired with Tea. So MsChen drinks Soda, and MsBao drinks Tea.
8The complete solution
MsAllen: stall 1, Blue, Coffee
MsBao: stall 2, Purple, Tea
MsChen: stall 3, Red, Soda
MsDiaz: stall 5, Yellow, Water
MsEom: stall 4, Green, Juice
MsBao: stall 2, Purple, Tea
MsChen: stall 3, Red, Soda
MsDiaz: stall 5, Yellow, Water
MsEom: stall 4, Green, Juice
Every clue checks out. No clue is wasted, no deduction is guessed.
General strategy
- Start with the directs. Clues that say "X is Y" go straight on the grid as circles. They are your foundation.
- Chain shared items. If clue A says "X is 3" and clue B says "Red is 3", then X = Red. Linking sub-grids this way is the fastest path forward.
- Use negatives ruthlessly. Each "not paired" clue is an X. When K-1 cells in any row of K are X, the last cell is a circle.
- Decode every clue fully. An ordering clue like "A is less than B" eliminates B from the lowest position AND A from the highest position AND A=B entirely.
- Re-scan after every mark. A new circle or X might force another deduction somewhere else. Sweep the grid each time you write something new.
- Trust the math. Every puzzle from this app has exactly one solution. If you reach a dead-end, you missed a deduction, never the puzzle\'s fault.