The Fortune City system
A budgeting app where the gamification is entirely free and the actual financial tools are behind the paywall.
The design logic
Fortune City's system is organized around a deliberate inversion: the gamification (city building, citizens, achievements, daily rewards, quests, merging) is entirely free, while the subscription ($69.99/year) gates the financial intelligence tools, budget categories, trend reports, expense review, and Fisher's analytical functions. Entertainment is free; usefulness is premium. The salesman character, a recurring city resident whose function is to frame ad watching as civic virtue, is the most narratively integrated ad placement in the library.
The mechanic sequence
The core loop is: record a real expense → a building appears in the city → recruit citizens → assign jobs → citizens generate coins passively → collect coins → upgrade City Hall → visit bulletin board for quests (help the salesman = watch an ad) → earn diamonds → spend on citizens and themes → record the next expense. Every session starts with an expense record.
The system map
Tap any + on a connection to see how the two mechanics interact100 achievements including Watch Ads to Help the Salesman (5 to 1,000 ad watches) and Best Apps (install other Sparkful titles), the achievement system drives both platform-beneficial behavior and player progression simultaneously.
The salesman character frames rewarded ad watching as helping an overworked city resident with voiced personal stories, the only ad placement in the library that creates a recurring named character relationship around the ad-watching action.
Fisher unlocks after four consecutive days of expense tracking and is teased with a silhouette preview, the most behaviorally intentional content gate in the library.
Day 2 reward hidden as a question mark, the only daily login calendar in the library that applies variable reward uncertainty to the return incentive. The ad doubling option is integrated into every daily claim.
The Flyer Board quest and the salesman ad are the same action. The quest system gives ad watching a narrative frame and a named completion reward, directing users to the salesman who would not seek him out voluntarily.
Fisher's four-day consecutive tracking gate is the most behaviorally intentional content gate in the library. A financial advisor character is unlocked only after demonstrating four consecutive days of the core habit the app is designed to build. The character's silhouette is visible from day one, creating desire for a reward that requires habit repetition to access.
The system works because every expense record simultaneously advances five parallel systems: builds a city (immediate visual reward), generates coins (economic reward), advances achievements (milestone reward), contributes to Fisher's unlock gate (habit reward), and provides data for the subscription's analytics (utility reward)
The system works because every expense record simultaneously advances five parallel systems: builds a city (immediate visual reward), generates coins (economic reward), advances achievements (milestone reward), contributes to Fisher's unlock gate (habit reward), and provides data for the subscription's analytics (utility reward). The single input, recording an expense, produces five outputs across five systems.