An ad-free number-deduction game with a 100-level campaign, daily challenge, infinite modifier ladder, and opt-in real-player competition.
Project proof100 levels · daily playAd-free, offline-first, with an endless competitive ladder
App Store release candidate · final iPhone QA
React NativeExpoFirebaseTypeScriptZustand
A small puzzle with a full-game finish
The experience pairs a one-thumb dial puzzle with the pace, feedback, rewards, and competition expected from a polished mobile release.
100campaign levels
2–6digits per vault
590automated tests
01
Instantly readable
Large dials, clear clue language, and short attempts keep deduction—not interface decoding—at the center.
02
Depth without pressure
Campaign, daily, ladder, awards, and skins add reasons to return without ads or a required account.
03
Online by choice
Real-player rankings are opt-in, transparent, and removable without sacrificing local progress.
01 · The brief
The challenge
The core puzzle had to be understandable in seconds but deep enough to support a full campaign. The larger challenge was creating meaningful reasons to return—daily competition, progression, rewards, and customization—without ads, mandatory sign-in, fake opponents, or an aggressive subscription funnel.
02 · The response
The solution
I built the release candidate in React Native and Expo around a tactile dial interaction, short feedback loops, and a progression system that keeps the number puzzle central. Zustand manages local progress; Firebase is used only after a player opts into real-player rankings; Expo IAP supports a single Premium unlock. The full campaign, daily challenge, ladder, skins, achievements, sound, haptics, and accessibility controls all work without advertising.
Key Features
01
Core puzzle
A readable deduction loop that grows from quick locks into difficult vaults.
100-level campaign with 5 difficulty tiers
Two- through six-digit vaults with Correct, Hot, Warm, and Cold deduction clues
Daily challenge, streak rewards, and same-day real-player rankings
Infinite competitive ladder with rotating gameplay modifiers
02
Progression and feel
Rewards, customization, sound, and accessibility give the game a finished rhythm.
Collectible vault skins, achievements, and progression rewards
Original seven-sound pack, haptics, Reduced Motion, and separate audio controls
03
A fair product model
Offline play, opt-in competition, and one permanent purchase replace pressure tactics.
Offline-first play with no account required for the campaign
Explicit opt-in before anonymous Firebase rankings are enabled
One-time $4.99 Premium unlock for unlimited Lock Picks and premium skins
Online-data deletion from Settings without erasing local campaign progress
01
Core puzzle
A readable deduction loop that grows from quick locks into difficult vaults.
+
100-level campaign with 5 difficulty tiers
Two- through six-digit vaults with Correct, Hot, Warm, and Cold deduction clues
Daily challenge, streak rewards, and same-day real-player rankings
Infinite competitive ladder with rotating gameplay modifiers
02
Progression and feel
Rewards, customization, sound, and accessibility give the game a finished rhythm.
+
Collectible vault skins, achievements, and progression rewards
Original seven-sound pack, haptics, Reduced Motion, and separate audio controls
03
A fair product model
Offline play, opt-in competition, and one permanent purchase replace pressure tactics.
+
Offline-first play with no account required for the campaign
Explicit opt-in before anonymous Firebase rankings are enabled
One-time $4.99 Premium unlock for unlimited Lock Picks and premium skins
Online-data deletion from Settings without erasing local campaign progress
Interface overview
The product as a complete system
Core flows, states, and decisions—presented together.
01
02
03
04
05
06
01
Home vault
Campaign progress, Lock Picks, daily access, rank, and the selected vault skin are legible at a glance.
Tap the Safe home screen with campaign progress, daily challenge, vault, and navigation
02
Core puzzle
Adjust each dial, try the lock, then use Correct, Hot, Warm, and Cold feedback to narrow the code.
Tap the Safe two-dial gameplay screen with timer and unlock action
03
100-level campaign
Five tiers expand from two-digit Apprentice Locks to six-digit Master Vaults with a readable progression path.
Tap the Safe campaign level map showing five difficulty tiers
04
Vault collection
Earned and premium vault styles give progression a visible reward without placing ads inside the game.
Tap the Safe vault skin collection and customization screen
05
Long-term goals
Awards turn skill, consistency, and exploration into goals beyond simply clearing the next lock.
Tap the Safe achievement awards screen
06
Opt-in rankings
Daily and all-time boards show real players only, and online ranking stays off until the player explicitly opts in.
Tap the Safe daily real-player leaderboard and rankings screen
Product status
Version 1.0 is in App Store Connect and final iPhone release QA; it is not presented as publicly released
The release candidate passes 590 automated tests across 33 suites and all 18 Expo Doctor checks
Campaign play remains offline and account-free, while rankings create an anonymous account only after consent
One permanent Premium purchase replaces subscriptions and ads, keeping the product model easy to understand
How it was built
Selected build tools
React Native
Expo
Firebase
TypeScript
Zustand
Bring this care to your project
What should your website make easier?
Tell me what customers need to understand, trust, or do. I will shape that into a focused website—and stay available after it launches.
