CONSTRAINT PLACEMENT
1. Queens
A refined take on Star Battle and N-Queens. Deduce which cell in each polyomino region holds the crown using row/column elimination and diagonal adjacency bounds.
👑 Four Pure Logic Puzzles • One Morning Ritual
Calm, Tactile Daily Logic for iPhone & iPad.
Every midnight UTC, Lattice generates a deterministic 4-puzzle logic suite — Queens, Shikaku, Zip, and Tango. Zero guesswork, zero accounts required, and guided by Archimedes the origami owl.
✓ 100% Deterministic Solvable Grids
✓ Apple Game Center Rankings
✓ Offline-First SwiftUI
Meet Archimedes
"Every grid has a single logical truth. No guessing — just pure deduction!"
Interactive Web Sandbox
Test-Drive All 4 Logic Engines Right Now
Tap any puzzle below to play a live 4×4 mini-grid directly in your browser. Experience the rules before downloading the full iOS & iPadOS app.
MODE: QUEENS (4×4)
MOVES: 0
Queens — Star Battle Deduction
Place exactly 4 Crowns (👑) on the grid so that every row, every column, and every colored region contains exactly one crown. Two crowns can never touch — not even diagonally!
- 👆 Tap once to mark an elimination cross (×)
- 👑 Tap twice to place a golden Crown (👑)
- 🚫 Crowns cannot share a row, column, color region, or diagonal touch
Place 4 crowns without any red conflict highlights!
The Daily Quartet
Four Distinct Mathematical Disciplines
Designed to exercise spatial partitioning, binary deduction, Hamiltonian pathfinding, and constraint satisfaction in under 10 minutes each morning.
SPATIAL GEOMETRY
2. Shikaku
Partition the entire lattice into non-overlapping rectangles. Every rectangle must enclose exactly one numbered clue equal to its width × height area, with smart gesture clamping.
HAMILTONIAN TRAIL
3. Zip
Draw a single continuous orthogonal path from waypoint 1 to the final anchor that visits every cell on the board exactly once without crossing or backtracking.
BINARY DEDUCTION
4. Tango
Fill the grid with Suns and Moons. Every row and column requires an equal balance, no three identical symbols may sit adjacent, and wall clues (= and ×) lock relative pairs.
Universal Native SwiftUI
Crafted for iPhone & iPad Pro
Adaptive layouts scale effortlessly from one-handed iPhone portrait play to expansive two-column iPad Pro split canvases.
iPhone 16 Pro Max — Today Hub with Daily Progress, Streak Counter & 4 Puzzle Cards
No Subscriptions, Ever
Free Daily Ritual. Fair Lifetime Upgrade.
Play every day for free, or unlock the entire historical archive and remove all ads forever with a single one-time purchase.
ALWAYS FREE
Included Free on iOS
$0
Full daily ritual with zero paywalled mechanics.
- ✓ All 4 Daily Puzzles (Queens, Shikaku, Zip, Tango)
- ✓ Last 7 Days of Rolling Calendar Archive
- ✓ Unlimited Practice Sandbox (Easy, Medium, Hard)
- ✓ Apple Game Center Global & Friends Leaderboards
- ✓ Watch a short rewarded ad to unlock any older archive day
ONE-TIME LIFETIME PASS
Unlock Inside Lattice App →
$4.99 once
Own Lattice Pro forever across all your Apple devices.
- 👑 100% Ad-Free Experience Forever (Zero interstitials or sponsor cards)
- 🗓️ Unlimited Historical Calendar Archive (Play every past daily date)
- 🔄 Instant Family & Multi-Device Restore via StoreKit 2
- 🦉 Supports independent puzzle engineering at Jeong Inc.
Questions & Answers
Frequently Asked Questions
Do I need to create an account or sign in to play Lattice? +
No. Lattice requires zero registration, email, or sign-up. Your daily streaks, solve times, and puzzle states are stored locally on your device. If you have Apple Game Center enabled, your combined daily solve time can optionally sync to the leaderboards.
Are the daily puzzles identical for everyone around the world? +
Yes! Every calendar date seeds our deterministic puzzle generator (`DailySeedGenerator`), producing the exact same Queens, Shikaku, Zip, and Tango boards for every player globally so you can compare times and share spoiler-free emoji result cards.
Can I play Lattice offline on a flight or subway? +
100% yes. All 4 puzzle generators and validators run natively on-device in Swift. You never need an internet connection to play Today’s Ritual, past archive dates, or unlimited Practice Sandbox boards.
How do I restore my Lattice Pro ($4.99) purchase on a new iPhone or iPad? +
Open the Archive tab or Lattice Pro sheet and tap "Restore Purchase". StoreKit 2 automatically verifies your Apple ID entitlement and unlocks Lattice Pro across all your devices at no extra charge.