Logic Lattice — Three Sudoku Puzzle Modes, One Grid

A complete, production-ready HTML5 logic-puzzle game built for commercial distribution. Zero external JavaScript dependencies. Runs on any modern browser straight from a static file host with no build step required.

Overview

Logic Lattice bundles three Sudoku variants on one shared 9×9 engine: Mathdoku Towers (bold-outlined cages that must satisfy a +, −, ×, or ÷ equation, with no repeated digit inside a cage), Consecutive Sudoku (classic Sudoku with dots marking every pair of neighboring cells whose final digits are consecutive), and Arrow Sum Sudoku (classic Sudoku where the digits along each arrow must add up to the circled digit at its start). Every puzzle is generated procedurally at play time — there is no bundled puzzle list. The game features Easy/Medium/Hard difficulty tiers plus a seeded Daily Challenge, five selectable board themes (each with its own fixed background image), an optional Cartoonic Mode visual style, a shared XP progression system with seven rank tiers, a local best-times leaderboard, an eight-achievement system, a configurable hint system, and a full sponsor/ad integration framework — all in a single self-contained HTML5 package.

About the Game

Entry point is index.html — no build step, no CLI tools, no package manager required
Pure vanilla HTML5, CSS3, and ES6+ JavaScript — zero libraries, zero frameworks
Game engine and UI for all three puzzle modes are contained in a single IIFE in scripts/js/game.js
There is no bundled puzzle file — Mathdoku Towers, Consecutive Sudoku, and Arrow Sum Sudoku boards are all generated algorithmically at runtime, for every difficulty tier
All CSS lives in scripts/css/style.css; sponsor/ad placeholder in scripts/sponsor/sponsor-placeholder.html
Ads are switched on or off from a single file: scripts/config/ads.js
Five bundled background images, one per theme (scripts/images/bg-amber.webp, bg-jungle.webp, bg-obsidian.webp, bg-midnight.webp, bg-crimson.webp) and one favicon (favicon.jpg)
Procedural Web Audio API sound engine — no audio files bundled
All game state persisted to localStorage with graceful degradation when storage is unavailable
Browser support check on boot — displays a dedicated “Browser Not Supported” screen if requirements are not met

Puzzle Modes

The mode is chosen right after the lobby, on its own dedicated “Choose a Mode” screen, before difficulty. All three modes share the same 9×9 grid, row, and column rules — only the extra rule changes.

Mathdoku Towers — Fill the grid 1–9 with no row or column repeating a digit. Every bold-outlined cage’s cells must combine — in any order — to reach the target number and operator (+, −, ×, ÷) printed in its corner, with no digit repeated inside a single cage.
Consecutive Sudoku — Standard row, column, and 3×3 box rules, plus a small dot printed between every pair of neighboring cells whose final digits are consecutive (like 4 and 5). Two neighboring cells with no dot between them can never end up consecutive.
Arrow Sum Sudoku — Standard row, column, and 3×3 box rules, plus every arrow’s circled starting cell must equal the sum of all the digits sitting along the line the arrow draws through the grid.

The difficulty screen’s heading, subheading, and difficulty descriptions all update dynamically to match the selected mode.

Difficulty

Easy — Mathdoku Towers uses smaller cages with only + and − operators; Consecutive and Arrow Sum Sudoku start with 38 given digits and 9 arrows respectively.
Medium — Mathdoku Towers adds × to the cage operators; Consecutive and Arrow Sum Sudoku drop to 30 given digits and 7 arrows.
Hard — Mathdoku Towers uses all 4 operators (+, −, ×, ÷) with larger cages; Consecutive and Arrow Sum Sudoku drop to 24 given digits and 5 arrows — the toughest logic for every mode.
Daily — a puzzle unique to each player, seeded from today’s date plus a per-device player ID, built at a configurable difficulty (Medium by default via dailyDifficulty). No server or puzzle database — a fresh puzzle is generated every calendar day and never repeats. The Daily Challenge is shared across all three modes: completing it once, in any mode, marks the Daily card done for that calendar day everywhere, and unlocks again automatically the next day.

The grid is always 9×9 for every mode and difficulty — difficulty controls cage size and operator count (Mathdoku Towers) or how many digits/arrows are pre-filled (Consecutive, Arrow Sum), not the grid size itself.

Import Puzzle (All Modes)

On the difficulty screen, in any of the three modes, players can paste a complete, already-solved 81-digit grid (digits 1–9, no zeros) into the Import Puzzle panel. The game validates that every row and column is legal (and every 3×3 box too, for Consecutive and Arrow Sum Sudoku), then builds the puzzle around it using whichever mode is currently selected — Mathdoku cages, Consecutive dots, or Arrow Sum arrows — at Medium complexity, and loads it as a custom puzzle. Custom puzzles are not recorded on the leaderboard.

Themes

Five board themes are selectable from the “Board · Style” screen, shared across all puzzle modes. Each theme owns one fixed background image — there is no separate background picker. The active theme is saved to localStorage and restored on every visit. The default theme is Warm Paper.

Warm Paper — classic parchment feel (default)
Jungle — dense canopy darkness
Neon City — electric arcade glow
Midnight Ink — sleek deep universe
Rose Gold — warm blush elegance (marked as new)

A separate Cartoonic Mode toggle (Settings → Appearance) can be layered on top of any theme — it adds chunky sticker-style borders, drop shadows, and a playful rounded font to the UI without changing any theme’s colors.

How to Play

From the lobby, press Play to go to the Choose a Mode screen.
Choose Mathdoku Towers, Consecutive Sudoku, or Arrow Sum Sudoku.
Select Easy, Medium, Hard, or Daily on the difficulty screen. The Import Puzzle panel is available here in every mode.
In Mathdoku Towers: fill every cell 1–9 with no repeats in a row or column, and make every cage’s cells combine to its target using the operator shown, with no repeated digit inside the cage.
In Consecutive Sudoku: fill every cell 1–9 with no repeats in a row, column, or 3×3 box, keeping every dotted pair of neighboring cells consecutive and every undotted pair non-consecutive.
In Arrow Sum Sudoku: fill every cell 1–9 with no repeats in a row, column, or 3×3 box, and make every arrow’s circled digit equal the sum of the digits along its path.
Use Check, Hint, Undo, Reset, and New as needed, then complete the puzzle to see your time, moves, mistakes, and XP earned.

Game Screen Controls

Every mode uses a numpad (tap a cell, then tap 1–9) plus a left-side action sidebar:

Check — checks every filled cell against the solution; shows a toast for remaining cells or shakes any cells that are wrong.
Hint — fills a cell with its correct digit.
Undo — reverts the last placed digit or pencil mark.
Reset — restarts the same puzzle from scratch, with confirmation.
New — returns to the lobby to start a new puzzle, with confirmation.
Pencil (numpad button, or press P) — toggles candidate-note mode for a cell instead of placing a final answer.
Pause — pauses the timer with a popup to Resume, start a New Game, or Quit to Lobby.

Keyboard Shortcuts

1–9 — place a digit in the selected cell
Backspace / Delete / 0 — clear the selected cell
P — toggle pencil mode
Ctrl+Z (or Cmd+Z) — undo the last move
Arrow keys — move the selected cell
Esc — open/close the pause popup

XP and Rank System

All three modes award XP toward one shared rank system using the same formula: a base amount per difficulty, plus a bonus for finishing with zero mistakes, plus a bonus for finishing under the par time for that difficulty. Both bonus amounts and all base/par values are configurable.

The seven rank tiers:

Apprentice — 0 XP
Solver — 300 XP
Thinker — 800 XP
Expert — 1,800 XP
Master — 3,500 XP
Sage — 6,000 XP
Grand Master — 10,000 XP

The current rank and progress toward the next tier are shown as an XP bar in the lobby.

Achievements

Eight achievements are tracked and displayed as badges in the lobby once unlocked (the lobby shows a handful at a time, with a “See More” button opening a full Achievements page for the rest):

First Win — complete your first puzzle, in any mode
Perfect Solve — finish a puzzle with zero mistakes
Speed Demon — finish a puzzle in under 3 minutes (best time)
3-Day Streak — reach a win streak of 3
7-Day Streak — reach a win streak of 7
Hard Mode — complete a puzzle on Hard difficulty
10 Puzzles — complete 10 puzzles
Daily Champ — complete a Daily Challenge

All three modes count equally toward these achievements and toward the games-played, best-time, and streak stats shown on the lobby.

Leaderboard (Best Times)

A local best-times leaderboard is accessible from the lobby, with Easy / Medium / Hard tabs, ranked by fastest time (up to 10 entries per tab by default, configurable). Each entry records time, mistake count, and date. Wins from all three modes share the same Easy/Medium/Hard tabs — there is no separate leaderboard per mode. Daily Challenge wins are recorded under the Medium tab. Custom-imported boards are excluded. The leaderboard can be cleared from its own screen.

Settings

All settings are accessible from the lobby settings button. The board Theme and the Cartoonic Mode toggle are the only choices saved to localStorage and restored on every visit. The remaining toggles below are session-only — they reset to defaults on page reload and are not written to localStorage.

Sound Effects — toggle procedural Web Audio API sounds for moves, errors, and win sounds. Can also be toggled from the lobby’s sound icon. Session-only.
Show Errors — highlights incorrect numbers in red. Session-only.
Highlight Same Numbers — shows matching digits when a cell is selected. Off by default. Session-only.
Animated Particles — toggle the floating background particle animation on the canvas layer. Session-only.
Cartoonic Mode — adds chunky borders and a playful font on top of every theme. Saved to localStorage.

Ad Monetization

The game ships with a fully integrated, configurable sponsor/ad system ready to connect to any ad network.

Ads are displayed in a popup containing an iframe sized to the standard 300×250 Medium Rectangle format
The placeholder iframe automatically receives the active theme’s ink/accent colors and current Cartoonic Mode state as URL parameters, so a placeholder — or a real ad creative built to read them — can match whatever look the player has chosen
A countdown timer starts at 5 seconds by default (configurable via ads.preGame.countdown). The Skip button is disabled until the countdown reaches zero
Ad content is loaded from scripts/sponsor/sponsor-placeholder.html. The file contains clearly marked AD REPLACEMENT START and AD REPLACEMENT END comment blocks showing exactly where to paste ad code
The entire ad system can be disabled by setting ads.enabled or ads.preGame.enabled to false in scripts/config/ads.js. As shipped, scripts/config/ads.js sets ads.enabled: true, so the sponsor popup is on by default — set it to false to turn it off
Ad trigger points: before a puzzle starts, whether from Start Puzzle, Play Again, or the Import Puzzle panel

Important: Ad network integrations such as Google AdSense, AdMob, and ironSource are third-party external services not affiliated with or included in this product. Each network operates independently and has its own account registration process, eligibility requirements, approval policies, and potentially associated costs. Logic Lattice provides the ad slot infrastructure only — buyers are solely responsible for obtaining their own accounts, meeting each network’s requirements, and complying with their respective terms of service.

Ad Network Approval FAQ

Do I need to register with the ad network first? Yes — every ad network requires its own account, registered and approved by that network, before real ads will show in the sponsor slot.
Who approves my account? The third-party ad network itself, entirely on its own terms. This product only provides the ad placement/integration infrastructure — it has no role in, and no control over, that decision.
Is approval guaranteed? No. Approval is not guaranteed by this product or its author; each network reviews applications against its own eligibility requirements and policies.
How long does approval take? Review and approval times vary by provider and are set entirely by that provider.
What is the buyer responsible for? Meeting the ad network’s eligibility requirements, agreeing to its terms of service, and maintaining the account — this product cannot guarantee eligibility on the buyer’s behalf.

Configuration System

Game behavior is controlled by a window.EQUATION_CONFIG object, which scripts/config/ads.js creates and adds its ad settings to. Add further keys to that same object (or your own script loaded before game.js) to customize other behavior. All values have built-in defaults so the game runs without any config. Configurable options include:

Default theme (defaultTheme)
Show/hide timer (showTimer)
Mistake threshold before the “keep going” toast appears (mistakeLimit, default 3; 0 = never shown)
Difficulty used to build the Daily Challenge puzzle (dailyDifficulty, default “medium”)
Optional Time Attack countdown, any non-Daily puzzle (timeAttackSeconds, 0 = disabled by default)
Cap on hints per game, shared across all modes (maxHintsPerGame, 0 = unlimited, default)
XP base values per difficulty and bonuses (xp.easy, xp.medium, xp.hard, xp.noMistakeBonus, xp.speedBonus)
Par times per difficulty for the speed bonus (parTime.easy, parTime.medium, parTime.hard)
Difficulty label text per difficulty (difficulty.easy.label, and matching keys for medium/hard/daily)
Leaderboard max entries (leaderboardMaxEntries, default 10)
Ad system enable flags and countdown duration (ads.enabled, ads.preGame.enabled, ads.preGame.countdown)
Confetti and particle enable/count/speed (confetti.enabled, confetti.count, particles.enabled, particles.count, particles.speed)

Tech Stack

HTML5 — all screens and markup for all three modes in a single index.html
CSS3 — custom properties for theming, flexbox, keyframe animations, canvas particle layer
Vanilla JavaScript ES6+ — single IIFE module, arrow functions, Set/Map, template literals
Procedural puzzle generator — Mathdoku Towers, Consecutive Sudoku, and Arrow Sum Sudoku boards are all built algorithmically at runtime; a seeded RNG mixes today’s date and a per-device player ID to give each player their own never-repeating Daily Challenge, with no server or puzzle database
Web Audio API — procedural sound effects; no audio files
Canvas API — floating background particles and win confetti animation
Google Fonts CDN — Crimson Pro (400, 600), DM Sans (300, 400, 500), and Baloo 2 (500, 600, 700, 800) for Cartoonic Mode
localStorage — theme, Cartoonic Mode, stats/XP/achievements, and leaderboard state
No frameworks, no npm, no build tooling

Third-Party / External CDN Dependencies

This project relies on an external CDN for one resource. This dependency is third-party, hosted and operated outside of this project and outside of the seller’s control — its uptime, availability, and any future changes to its terms are the responsibility of the provider, not the seller.

Google Fonts — loaded from fonts.googleapis.com via @import rules in scripts/css/style.css, providing the Crimson Pro (400, 600), DM Sans (300, 400, 500), and Baloo 2 (500, 600, 700, 800) font families.

An active internet connection is required for the browser to reach this CDN and load these fonts. Without one, the game still runs normally — text simply falls back to the browser’s default system font. Buyers who need a fully offline build can download the font files, host them locally, and replace the @import lines in style.css with local @font-face rules.

No other third-party or CDN-hosted libraries (such as Chart.js, jsPDF, three.js, or html2canvas) are used anywhere in this codebase.

Requirements and Compatibility

Any modern browser: Chrome, Firefox, Safari, Edge (browser support is checked at boot and requires localStorage, AudioContext, document.querySelector, Promise, Set, and Array.from)
No server-side code required — deploy to any static file host (GitHub Pages, Netlify, S3, cPanel, etc.)
Internet connection required for Google Fonts (Crimson Pro, DM Sans, and Baloo 2) to load correctly
Fully responsive — layout adapts to desktop, tablet, and mobile screen sizes
Internet Explorer is not supported (the codebase uses ES6+ features such as arrow functions, Promise, and Set)
All localStorage access is wrapped in try/catch for safe degradation in private browsing mode

Logic Lattice | HTML5 Sudoku Puzzle Game