--- schema_type: "SoftwareApplication" entity_type: "Mobile Application" app_name: "Fill Shikaku" developer_entity: "Voodoo" bundle_id: "com.aa.fillshikaku" app_store_id: "6443563905" category: "Games" primary_platform: "ios" primary_monetization: "Freemium" offline_capable: false market_region: "US" platforms: "iOS & Android" app_last_updated: "2025-11-24" report_date: "2026-05-04" report_version: "1.5.4" total_reviews: 6193 overall_rating: 4.29 sentiment: "Frustrated" sentiment_score: 25 confidence: "high" confidence_score: 0.75 top_praise_theme: "Core puzzle mechanics provide a satisfying and challenging brain training experience for casual players" top_complaint_theme: "Aggressive ad frequency and mid-level interruptions destroy the flow of the core puzzle experience" review_sample_size: 99 total_review_count: 99 analyzed_review_count: 99 data_age_days: 58 momentum_velocity: "zombie" intelligence_version: 3 nemesis: "100 Logic Games - Time Killers" competitor_count: 6 tags: ["games", "freemium", "frustrated sentiment", "mobile app", "app review", "app analysis", "casual", "mobile", "gamers"] canonical_url: "https://marlvel.ai/intel-report/games/fill-shikaku" license: "CC-BY-NC 4.0" content_version: "v2" last_verified: "2026-05-04T22:29:57.654Z" --- # Fill Shikaku App Audit ## TL;DR {#tldr} - **Category**: Games ยท Freemium - **Signal**: Rating 4.29 ยท Sentiment Frustrated - **Recent focus**: Aggressive ad frequency and mid-level interruptions destroy the flow of the core puzzle experience (top complaint) ยท Core puzzle mechanics provide a satisfying and challenging brain training experience for casual players (top praise) > **TL;DR:** Fill Shikaku is a games app by Voodoo, rated 4.29/5 by 6.2K users, with Frustrated user sentiment (25/100), available on iOS & Android. > > **Marlvel.ai App Intelligence** โ€” Independent analysis. US Market. No publisher influence. > **Key Insight:** Fill Shikaku faces Frustrated user sentiment (4.29/5 from 6.2K reviews), with aggressive ad frequency and mid-level interruptions destroy the flow of the core puzzle experience as the primary user concern. ## Quick Facts | Fact | Value | | :--- | :--- | | **Rating** | 4.29/5 (6.2K reviews) | | **User Mood** | Frustrated | | **Category** | Games | | **Developer** | Voodoo | | **Pricing** | Freemium | | **Platforms** | iOS & Android | | **Confidence** | High (0.75/1.0) | | **Data Age** | 0d | ## Metadata & Market Performance - **Publisher:** Voodoo - **Category:** Games - **Target Audience:** Casual mobile gamers interested in logic-based puzzles and grid-style brain teasers. - **Platforms:** iOS & Android - **Version Audited:** 1.5.4 - **Audit Date:** 2026-05-04 - **Signal Count:** 99 reviews analyzed - **Confidence:** High (0.75/1.0) - **App Store ID (iOS):** 6443563905 - **Bundle ID:** com.aa.fillshikaku - **Google Play ID:** com.aa.fillshikaku - **Performance Trend:** Declining - **Data Window:** Analysis based on signals collected up to 2026-05-04 - **Short Description:** Divide the grid into rectangular pieces! ## Executive Snapshot **What it is:** Fill Shikaku is a grid-based logic puzzle game for mobile devices where users divide space into rectangular pieces. **Why users hire it:** Users hire the app for low-stakes mental stimulation, but the current ad-heavy experience forces them to abandon the puzzle-solving flow. ## App DNA (Features & Intent) - **[Standard] Shikaku Grid Logic:** Grid-based puzzle mechanic requiring users to divide space into rectangles and squares based on numerical constraints * *User Intent:* Users expect intelligent, adaptive experiences that learn from their behavior. - **[Standard] Touch-and-Drag Input:** Gesture-based control scheme for defining rectangular boundaries on the game grid ## Market Position {#market-position} The app maintains a stable presence in the casual puzzle space with a 4.29 average rating across platforms. The high volume of ad-related complaints relative to the 99 analyzed reviews signals that monetization friction is currently outpacing the value of the core puzzle loop. ## Monetization Strategy - **Model:** Freemium - **Tiers:** Free with ad support, In-app purchases for ad removal - **Analysis:** Freemium model relies on ad-inventory for the majority of users, supplemented by in-app purchase conversion. ## ๐Ÿ”ด User Sentiment (High Confidence: 99 of 99 reviews analyzed) {#user-sentiment} - **Overall Rating:** 4.29/5 - **Platform Split:** iOS 4.5/5 (3.1K ratings) | Android 4.1/5 (3.1K ratings) - **Overall Sentiment:** Frustrated - **Note:** The 4.29/5 store rating reflects cumulative history, while the Frustrated sentiment reflects recent user reviews analyzed by our AI pipeline. ### Top Praises - **Core puzzle mechanics provide a satisfying and challenging brain training experience for casual players** ### Top Complaints (Impact Areas) - **Aggressive ad frequency and mid-level interruptions destroy the flow of the core puzzle experience** ## SWOT Analysis {#swot} **Core Strengths:** - Core puzzle logic provides high-frequency session potential - Gesture-based input lowers the barrier to entry **Critical Frictions:** - Ad-removal IAP failure reported in reviews - Aggressive ad frequency during active gameplay - Technical instability in ad-delivery modules **Growth Levers:** - Implement seasonal puzzle events to drive retention - Introduce tiered difficulty levels to expand player base **Market Threats:** - 100 Logic Games content variety - Rapid iteration cycles from newer puzzle entrants - Negative sentiment drag on new user acquisition ## Recent Changes (v2 โ†’ v3) {#recent-changes} The app transitioned to a freemium model, but technical instability and aggressive ad-delivery have resulted in negative user sentiment and critical churn risks. **Overall trend**: Declining **Compared at**: 2026-05-04 ### High-impact changes - **[Shifted] Monetization Model Update** (pricing) โ€” Pricing model shifted from free to freemium, adding in-app purchases for ad removal. - **[Declined] Negative Sentiment Emergence** (sentiment) โ€” Sentiment shifted to negative, with top complaints citing aggressive ad frequency and broken ad-removal purchases. ### Medium-impact changes - **[Added] Technical Weaknesses Identified** (swot) โ€” New weaknesses added to SWOT analysis: ad-removal IAP failure and technical instability in ad-delivery modules. ## Rivals Landscape {#rivals} > Competitive positioning identified by AI analysis of app features, category, and market signals. ### Fill Shikaku vs 100 Logic Games - Time Killers โ€” Head to Head - **[100 Logic Games - Time Killers](https://marlvel.ai/intel-report/games/100-logic-games-time-killers)** by Andrea Sabbatini: Offers a comprehensive suite of logic puzzles including Shikaku, directly competing for the same puzzle-solving audience. - **Moat strength:** Medium โ€” durable but contestable - **Key differences:** - Bundles 100 distinct puzzle types into a single app, providing significantly higher long-term content variety. - Focuses on a minimalist, utility-first interface that prioritizes rapid puzzle iteration over thematic visual flair. ### Contenders (Strong Challengers) - **[Flow Free: Warps](https://marlvel.ai/intel-report/games/flow-free-warps)** by Big Duck Games LLC [Moat: Medium]: Directly competes for the same grid-based puzzle demographic with high-frequency content updates. - Implements spatial 'warp' mechanics that add a layer of complexity beyond standard grid-filling puzzles. - Leverages a proven, high-retention visual language consistent with the broader Flow Free franchise ecosystem. ### Peers (What They Do Better) - **[Sudoku - Classic Sudoku Puzzle](https://marlvel.ai/intel-report/puzzle/sudoku-classic-sudoku-puzzle)** by Oakever Games: Dominates the broader puzzle category, capturing the same casual logic-game player base. - Offers advanced solver tools and automated hint systems that reduce friction for casual players. - Maintains a massive, evergreen content library that keeps users engaged through daily challenge cycles. - **[Nonogram.com - Number Games](https://marlvel.ai/intel-report/games/com-easybrain-nonogram)** by Easybrain Ltd: Shares the 'number-to-grid' logic mechanic, serving as a primary alternative for grid-based puzzle enthusiasts. - Utilizes a highly polished, thematic aesthetic that transforms abstract logic into recognizable pixel art. - Features a robust progression system with seasonal events that drive daily active user retention. ### New Kids on the Block (What's Innovative) - **[Number Match - Fun Puzzle Game](https://marlvel.ai/intel-report/games/com-diguotech-numbermatch)** by Shanghai Diguo Network Technology Co., Ltd.: Aggressive release cadence suggests rapid iteration and testing of new engagement mechanics. - **[Logic Grid Puzzles](https://marlvel.ai/intel-report/games/logic-grid-puzzles)** by Egghead Games LLC: High update frequency indicates a focus on content expansion and educational puzzle depth. ## What's New - **Latest (v1.0.0, 3 years ago):** Added new levels and background color options. ## App Momentum (Zombie) {#momentum} - Ships conformity updates and bug fixes - Maintains stable store presence > **Cadence:** 5 total versions ยท 2 majors in last 6 months ยท 161 days since last update ยท 155 days avg between updates ## The "So What?" (Strategic Takeaway) {#so-what} Fill Shikaku is a challenged games app that is free with in-app purchases. With a 4.29/5 rating from 6.2K reviews, it faces significant user friction. > **Bottom Line:** The app offers a solid core puzzle experience, but the aggressive ad-delivery and broken IAP logic are actively eroding the user base, so the PM must prioritize fixing the purchase flow and ad-timing to stabilize retention. **Best for:** Casual mobile gamers interested in logic-based puzzles and grid-style brain teasers. ### PM Action Plan (Next Best Moves) - [ ] [PIVOT] [HIGH IMPACT] Audit ad-removal IAP logic because users report persistent ads after purchase โ†’ reduce churn โ€” *Ad-removal IAP failure is a top-cited complaint theme in sentiment analysis.* _(trade-off: deprioritize Pause new level design sprints โ€” fixing purchase reliability is a prerequisite for monetization.)_ - [ ] [INVEST] [HIGH IMPACT] Shift ad frequency to post-level screens because mid-level interruptions destroy flow โ†’ improve retention โ€” *Sentiment analysis identifies mid-level ad interruptions as the primary driver of negative reviews.* _(trade-off: deprioritize Accept lower short-term ad impressions โ€” long-term retention gains offset the immediate inventory loss.)_ ### Feature Gaps vs Competitors - Multi-puzzle suite (available in 100 Logic Games but absent here) - Seasonal progression events (available in Nonogram.com but absent here) ### Outlook: Declining The casual puzzle market is consolidating around apps that balance monetization with a clean user experience, leaving Fill Shikaku exposed. If the team does not address the ad-removal failures and mid-level interruptions, the current negative sentiment trend will accelerate churn and permanently damage the app's store rating. - ๐Ÿ”ด Technical failures in ad delivery force users to restart the app, which compounds the frustration of aggressive ad frequency. - ๐Ÿ”ด Users report that paid ad-removal fails to function, creating a perception of deceptive business practices that drives uninstalls. ## Key Metrics Summary | Metric | Value | | :--- | :--- | | Overall Rating | 4.29/5 | | Total Reviews | 6.2K | | Sentiment | Frustrated (25/100) | | Confidence | High | | Pricing Model | Freemium | | Platforms | iOS & Android | | Key Features | 2 analyzed | | Trend | Declining | | Outlook | Declining | ## Competitor Comparison | App | Rating | Sentiment | Developer | | :--- | :--- | :--- | :--- | | **Fill Shikaku** (this app) | 4.29/5 | Frustrated | Voodoo | | [Number Match - Fun Puzzle Game](https://marlvel.ai/intel-report/games/com-diguotech-numbermatch) | 4.6/5 | N/A | Shanghai Diguo Network Technology Co., Ltd. | | [Sudoku - Classic Sudoku Puzzle](https://marlvel.ai/intel-report/puzzle/sudoku-classic-sudoku-puzzle) | 4.8/5 | Mixed | Oakever Games | | [Flow Free: Warps](https://marlvel.ai/intel-report/games/flow-free-warps) | 4.7/5 | Mixed | Big Duck Games LLC | | [Logic Grid Puzzles](https://marlvel.ai/intel-report/games/logic-grid-puzzles) | 4.9/5 | N/A | Egghead Games LLC | | [100 Logic Games - Time Killers](https://marlvel.ai/intel-report/games/100-logic-games-time-killers) | 4.7/5 | N/A | Andrea Sabbatini | ## Company Profile - **Developer:** Voodoo - **Website:** [https://www.voodoo.io](https://www.voodoo.io) - **Social:** [Instagram](https://www.instagram.com/voodoo.io) ยท [X/Twitter](https://twitter.com/voodooplatform) ยท [LinkedIn](https://www.linkedin.com/company/voodoo) ## Data Sources & Links - **App Store:** [View on Apple Store](https://apps.apple.com/us/app/fill-shikaku/id6443563905?uo=4) - **Google Play:** [View on Google Play](https://play.google.com/store/apps/details?id=com.aa.fillshikaku&hl=en&gl=us) - **Dev Site:** [Official Website](https://www.voodoo.io) - **Sources:** Developer website content, About us / company information, App store metadata, User reviews. ## Related Intel Reports - [*Number Match - Fun Puzzle Game*](https://marlvel.ai/intel-report/games/com-diguotech-numbermatch) (Shanghai Diguo Network Technology Co., Ltd.) โ€” 4.6/5 Rating | N/A Sentiment - [*Sudoku - Classic Sudoku Puzzle*](https://marlvel.ai/intel-report/puzzle/sudoku-classic-sudoku-puzzle) (Oakever Games) โ€” 4.8/5 Rating | Mixed Sentiment - [*Flow Free: Warps*](https://marlvel.ai/intel-report/games/flow-free-warps) (Big Duck Games LLC) โ€” 4.7/5 Rating | Mixed Sentiment - [*Logic Grid Puzzles*](https://marlvel.ai/intel-report/games/logic-grid-puzzles) (Egghead Games LLC) โ€” 4.9/5 Rating | N/A Sentiment - [*100 Logic Games - Time Killers*](https://marlvel.ai/intel-report/games/100-logic-games-time-killers) (Andrea Sabbatini) โ€” 4.7/5 Rating | N/A Sentiment - [*Nonogram.com - Number Games*](https://marlvel.ai/intel-report/games/com-easybrain-nonogram) (Easybrain Ltd) โ€” 4.6/5 Rating | Negative Sentiment - [*Royal Match*](https://marlvel.ai/intel-report/games/royal-match) (Dream Games) โ€” 4.7/5 Rating | Negative Sentiment - [*Brawl Stars*](https://marlvel.ai/intel-report/games/brawl-stars) (Supercell) โ€” 4.5/5 Rating | Mixed Sentiment - [*Stumble Guys*](https://marlvel.ai/intel-report/games/stumble-guys) (Scopely, Inc.) โ€” 4.5/5 Rating | Mixed Sentiment - [*Hole.io*](https://marlvel.ai/intel-report/games/hole-io) (Voodoo) โ€” 3.8/5 Rating | Terrible Sentiment ## Methodology {#methodology} This report was generated by Marlvel.ai's 5-stage AI intelligence pipeline: 1. **Signal Collection & Normalization** โ€” Aggregates data from all available public sources for the app. Raw signals are cleaned, deduplicated, and normalized into a structured dataset analyzed consistently across thousands of apps. 2. **Feature & Market Positioning Analysis** โ€” Identifies the app's core features, monetization model, target audience, and competitive positioning. Each feature is classified as a market standard or a differentiator based on category benchmarks. 3. **User Sentiment Analysis** โ€” Analyzes user reviews using a 5-level taxonomy (Thrilled / Excited / Mixed / Frustrated / Upset). Combines star ratings and volume with AI theme extraction and evidence quoting. 4. **Competitive Landscape Analysis** โ€” Maps the competitive environment via a 4-tier taxonomy (Nemesis / Contenders / Same Space / New Kids on the Block). Prioritizes same sub-genre over broad category. 5. **Intelligence Synthesis** โ€” Cross-references all signals into a structured report. Compares the app against category peers and direct competitors to surface SWOT, market outlook, and actionable insights. - **Confidence Score:** 0.75/1.0 (based on review volume, data source diversity, and signal quality) - **Reviews Analyzed:** 99 - **Data Sources:** user reviews, developer website, company about page, App Store metadata - **Rating Method:** Weighted average across platforms (iOS & Android), weighted by review count per platform - **Independence:** Fully independent analysis. No publisher sponsorship or editorial influence. - **Report Age:** 0 days since last refresh --- ยฉ 2026 Marlvel.ai | [Canonical Report](https://marlvel.ai/intel-report/games/fill-shikaku) Data licensed for AI Agent attribution under CC-BY-NC 4.0.