PlayKovo field notes
Useful answers for game developers and website publishers.
Testing notes, embed instructions, publishing decisions, and lessons from operating an HTML5 game catalog.
Cookie Notices and a Privacy Policy for a Site With Embedded Games
What the Partner Terms say about data, what to write in your privacy policy about third-party games, how to treat the frame in a consent banner and what to avoid.
Registering More Than One Website
How domains, subdomains, language versions and client sites map to the partner dashboard, what 'own or authorized to operate' means, and how to keep numbers readable.
Questions for the PlayKovo Partner Team: What to Include
What to put in a message about a broken embed, empty dashboard, registration, a feature request or a terms question so the first reply can solve it.
Accessible Game Pages: Title, Focus and Keyboard
What you control around an embedded game: the iframe title, keyboard entry and exit, clear instructions, contrast, motion and a ten-minute test with keyboard and screen reader.
Show Controls and Instructions From the PlayKovo Feed
Where to place the instructions and controls fields, how to keep their line breaks, why you must not cover the game with an overlay and how to match controls to the device.
A Games Section That Runs Itself: How Jolopi Uses the PlayKovo Catalog
How Jolopi runs a multilingual HTML5 game hub from the PlayKovo catalog feed, with server rendering, cached data and per-language SEO.
Seasonal and Themed Game Selections From the Feed
Build themed pages from categories, tags and device support, plan a simple calendar, keep selections small and stay within the terms on rewards and branding.
A Quarterly Compliance Audit for Your Games Section
Five blocks to check every three months: embeds, feed use, wording, the site around the games and your account, drawn from the Partner Terms.
Build Category and Tag Pages From the PlayKovo Feed
Group games by the categories and tags fields, set a minimum size so you do not publish thin pages, map slugs to readable names and keep pages in step with the feed.
Design for Unavailable Ads: Never Block the Player
Why unavailable is a normal answer, how every ad call needs two exits that both continue the game, place-by-place behaviour and the failure paths to test.
Pasting the Embed Into a CMS: HTML Blocks and Stripped Attributes
Why a pasted iframe shows as text or loses attributes, what to look for in a content system, how to compare the saved result with the original snippet and why templates help.
Cloud Save With a Local Fallback in the PlayKovo SDK
When to use cloudSave and when storage, why you must check ok instead of catching errors, how to save at checkpoints and a design that reads whichever save is newer.
Localize Your Game Menu With PlayKovo SDK getLanguage
The documented supported-list-plus-fallback pattern, handling regional codes, a manual language switch, text length, fonts and plurals.
Measure Your Games Section With Your Own Analytics
What your analytics can and cannot see around an embedded game, how to use them next to the partner dashboard, and where the terms draw the line on artificial launches.
The PlayKovo Review Checklist: Six Lines to Check Before You Submit
Each line of the portal's review checklist explained, plus a ten-minute pre-flight test covering load time, thumbnails, descriptions, tags, ads and deceptive behaviour.
Read Your PlayKovo Developer Analytics: Plays, Players and Impressions
What the Analytics page shows, its time ranges, why the revenue figure is zero today and a routine for turning plays and players into decisions.
What Visitors See When a Game Goes Away
Removed games, requested takedowns and temporary errors need different handling: detection, a game-unavailable page, redirects versus gone responses and cleanup.
Using PlayKovo Games Inside an App: What the Terms Cover
The Partner Terms apply to websites and apps. What that means for web views, referrers, permissions, store listings and children, and what to ask the partner team before building.
A Boot Sequence That Cannot Hang: Timeouts for Every Dependency
Using the roughly eight-second init() rejection as a design rule: a dependency table, a Promise.race timeout helper, honest loading screens and tests that break things on purpose.
Interface Details That Make a PlayKovo Game Feel Finished
Touch targets, instant feedback, readable text, clean pause and resume, sound, keyboard focus and the first ten seconds, with a short test table for frame and WebView.
Write Your Own Page for Each Game Instead of a Thin Copy
Why a frame plus the feed description is a weak page, what the Partner Terms let you reuse, what you can add from your own play, and a page structure that works.
Building PlayKovo with Supabase: From HTML5 Games to a Distribution Platform
How we use Supabase PostgreSQL, Authentication, Row Level Security and database functions to power our game portal, developer tools and partner distribution network.
How to Build a Games Section on Your Website With Free Embed Games (Layout and SEO)
Plan the structure, write useful game pages, handle phones and keep the feed in sync. A practical guide to a games section made from free embed games that search engines can understand.
How to Reduce HTML5 Game Size for Portals: What to Check and AI Prompts That Help
Portals judge your game by how fast the first screen appears, not by the zip limit. Measure first, then fix images, audio, models, code and loading order. Includes ready-to-paste prompts for AI coding tools.
129 Free Games for Your Website: PlayKovo Catalog via iframe and JSON Feed
As of October 29, 2026 the embed catalog has 129 games. Paste one iframe or pull the whole catalog from a JSON or XML feed.
Pause, Resume and Mute: Making Your HTML5 Game Behave on a Portal
Ads, hidden tabs and sound buttons all happen outside your game. Here is how to respond to them with the PlayKovo SDK.
Where to Place Ads in an HTML5 Game Without Losing Players
Good and bad moments for interstitials, rewarded ads that only pay out in the callback, error handling that never blocks the game, and a failure-path test list.
How to Embed an HTML5 Game on Your Website Without Breaking the Layout
The parts of a game iframe explained, a portrait variant, matching games to visitors, and the usual reasons an embed shows blank: CSP, CMS editors, referrer policy.
Game Embeds and Page Speed: How to Keep Core Web Vitals Healthy
Why iframes cost more than they look, one live game per page, lazy loading, a click-to-play cover with code, reserved space and how to measure the result.
Where to Find HTML5 Games for Your Website: Sources Compared and a Vetting Checklist
Three ways to get browser games for your site (catalog embeds, direct licensing, open source) with pros, risks and a checklist to vet any game before publishing.
Saving Player Progress in an HTML5 Game: localStorage, Iframes and Cloud Save
Why saves vanish in browsers and iframes, how to write save code that survives errors and updates, and how to add PlayKovo cloud save as a fallback-safe extra.
How to Encourage Healthy Gaming Habits on Your Website
Healthy play versus gaming disorder per the WHO, pressure mechanics to avoid, pause and optional break reminders, reward design and a checklist for small game portals.
How Pop-Ups, Autoplay Videos and Notifications Affect Website Visitors
How interruptions affect visitors, what WCAG and ad standards say, how to ask for notifications properly, and an annoying versus user-friendly page with working code.
How to Design a Child-Friendly Gaming Website Without Manipulative Features
Privacy and design principles for kids game sites, COPPA and the UK children code, deceptive patterns to remove, ad separation and a 20-point checklist.
Flashing Animations and Motion Sickness: Website Safety Explained
Photosensitive epilepsy and motion sensitivity explained carefully, what WCAG requires, and a working HTML and CSS example with prefers-reduced-motion and a pause control.
How to Make Your Website More Comfortable for People Who Read for Hours
Text size, line length, spacing, contrast, dark mode, mobile reading, animation and ads for long-form pages, with WCAG references and side-by-side CSS.
How to Stay Focused While Coding Without Relying on Energy Drinks
What caffeine does, why people react differently, how sleep and interruptions affect focus, and practical focus methods for developers without a single caffeine target.
Sitting for Eight Hours a Day: What Software Developers Should Know
What WHO, OSHA and large studies say about sitting and movement, an honest look at standing desks, and a sample movement and break plan for an eight-hour workday.
Developer Burnout: Early Warning Signs and How to Build Healthier Work Habits
The WHO definition of burn-out, how it differs from a busy period, early signs in development work, habits for individuals and teams, and a weekly self-check.
How to Reduce Eye Strain When Working With Code All Day
Font size, line height, contrast, dark versus light themes, screen setup and breaks for developers, with a copy-ready VS Code settings example.
How to Prevent Wrist and Hand Pain When Coding for Long Hours
Neutral wrist position, keyboard and mouse placement based on OSHA guidance, break and task-rotation methods, warning signs and an ergonomic desk checklist for developers.
How to Track Licensing Permissions for Hundreds of Browser Games
What to record for each game, a sample tracking table and a scalable system for permissions, iframe rights, evidence and removal requests.
How Much Does It Cost to Host 100 HTML5 Games?
Storage, requests and bandwidth math for 100 games using current Cloudflare R2 prices, three traffic scenarios and a comparison with embedding from a distributor.
How to Automatically Detect Broken HTML5 Games on Your Website
A working Playwright script, a GitHub Actions schedule and webhook alerts to find games that no longer load, with the limits of each check explained.
Why Your Game Website Has Hundreds of Games but Almost No Traffic
Duplicate catalogs, thin pages and indexing explain low traffic. Use Search Console to diagnose it and follow a prioritized plan for small game sites.
How to Choose Your First 20 Games for a New Gaming Website
A selection method and a sample 20-game collection from the PlayKovo embed catalog, balanced by genre, mobile support and distribution permission.
How to Build a Useful HTML5 Game Press Kit
What to put in a game press kit: logo, thumbnail, cover, screenshots, trailer and descriptions, plus a folder structure and copy-ready templates.
What Makes an HTML5 Game Start Feel Instant?
Why games open slowly, how preloading, lazy loading and asset optimization differ, why a loading screen is not a speed fix, and concrete steps to cut load time.
How to Prevent Old Cached Files From Breaking Game Updates
How browser and CDN caches break new game builds, and how to fix it with hashed file names, Cache-Control headers, manifests and service worker versioning.
Why Game Portals Count Plays Differently
Page views, game starts, sessions and unique players are different numbers. See why platforms disagree, how iframes limit measurement, and a worked example.
Inside PlayKovo: How We Review HTML5 Game Submissions
The three review steps, the technical and quality checks, common rejection reasons with examples, and a pre-submission checklist for HTML5 game developers.
Why Your Web Game Lags on Phones: Pixel Ratio, Shadows and Draw Calls
A game that runs at 60 FPS on a laptop and stutters on a mid-range phone usually has one of four causes. How to measure, and the fixes that pay off first.
Holding 60 FPS in Mobile Browsers: Frame Budget, Garbage Collection and Texture Memory
Where the 16.7 ms goes, why random hitches appear every few seconds, and how texture size becomes a memory problem long before it becomes a speed problem.
Embedding HTML5 Games Without Hurting Your Core Web Vitals
Reserve the space, load the frame late and keep one active game per page. A practical checklist for publishers who care about LCP, CLS and INP.
AdSense on a Game Site: What a Reviewer Actually Sees
A game page is mostly someone else's work in a frame. Real descriptions, honest numbers and a stated reason for every pick are what give a reviewer something to approve.
One Game, Many Sites: How HTML5 Game Distribution Works
Three ways to get a game onto other people's websites, how GameMonetize, Playgama and PlayKovo each approach it, and what a website owner can pull from our catalog today.
Making HTML5 Games With AI: Which Model to Use and How to Prompt It
Claude and ChatGPT Codex can both build a playable browser game in an afternoon. Whether it is a good game depends mostly on the brief you give them and how you test.
How to Prepare an HTML5 Game to Run Inside a Sandboxed iframe
Portals and partner sites load games inside sandboxed iframes with a restricted permission list. A checklist of what that breaks and how to test your build for it.
Why Game Websites Reject Your Game: What "Doesn't Meet Our Quality Standards" Really Means
A portal's generic rejection rarely explains itself. What reviewers actually look at, why a rejected game can be better than ones already listed, and how PlayKovo reviews every submission against the same standard.
Free HTML5 Games for Your Website: A Licensing Checklist
How to verify embed permission, advertising terms, branding rules, and removal procedures before publishing a free game on your site.
How to Choose Games for Your Website's Audience
A selection method based on visitor intent, session length, device mix, controls, and editorial fit rather than filling a page with random games.
How to Embed an HTML5 Game in WordPress Without Breaking Mobile
A WordPress-focused setup for custom HTML blocks, responsive iframe sizing, fullscreen permission, caching, and theme conflicts.
Popular HTML5 Games to Embed: How to Build a Defensible Shortlist
Use recent starts, repeat sessions, device support, and page fit to select popular embeds instead of copying a permanent top-ten list.
How to Build a Games Section for an Existing Website
Plan a useful game landing page, category structure, cards, detail pages, feeds, and removal workflow before importing a large catalog.
Mobile-Friendly Embedded Games: Portrait, Landscape, and Touch
Test orientation, viewport height, safe areas, two-thumb controls, fullscreen, and browser chrome before calling an embedded game mobile-ready.
How to Test an HTML5 IO Game Before Submitting It to a Portal
Release tests that catch problems a working preview tab misses, including a two-finger input test and a useful bug-report format.
How to Write an HTML5 Game Description and Controls for a Portal
A worked Turf.io example showing how to describe the core loop, loss condition, controls, multiplayer status, and save behavior.
Adding an HTML5 Game to a Website with an iframe
A step-by-step PlayKovo embed setup covering responsive sizing, iframe permissions, Content Security Policy, and mobile testing.
Iframe Embeds and JSON Feeds for a Website Game Catalog
Use individual iframe codes for a small curated page and a JSON or XML feed for a catalog that must update automatically.
A Checklist for Third-Party HTML5 Game Embeds
Review permission to publish, iframe origin, advertising behavior, privacy terms, performance, mobile support, and removal procedures.
Measuring the Effect of Embedded Games on a Website
Set up a controlled comparison before claiming a lift in engaged time, return visits, page speed, or advertising revenue.
Five HTML5 Game Embed Problems and Their Fixes
Diagnose responsive sizing, iframe permissions, Content Security Policy, stale game URLs, and missing touch support.
Versioning an HTML5 Game Without Breaking Player Saves
A safe update strategy for localStorage, IndexedDB, cached builds, and save-data migrations when players may return months after their last session.
Comparing Ad Networks for an HTML5 Game
Compare direct networks, mediation, portal SDKs, geographic fill, payment terms, consent requirements, and maintenance cost.
When Ad Mediation Makes Sense for an HTML5 Game
Use fill rate, impression volume, regional coverage, and maintenance cost to decide whether a second network is justified.
Reading Retention and Session Data for an HTML5 Game
Use D1 and D7 return rates, session distribution, first-session exits, and version comparisons to find where players leave.
Responsive Layouts for HTML5 Games
Choose a scaling model, protect the playable area, account for safe zones, and test real portrait and landscape viewports.
Better Titles and Thumbnails for HTML5 Games
How to show the playable action at small sizes, write a specific title, and test discovery assets without misleading players.
GDPR, COPPA, and Ad Consent Basics for HTML5 Game Developers
A starting checklist for data collection, consent, child-directed content, third-party SDKs, and the questions to raise with a qualified adviser.
Designing Touch Controls for Mobile HTML5 Games
Plan touch targets, gesture conflicts, safe areas, orientation, feedback, and two-thumb play before adapting a mouse interface.
Localizing an HTML5 Game for Turkish Players
A Turkish localization workflow covering player-facing text, dotted and dotless I, font coverage, layout expansion, screenshots, and store copy.
Marketing Your Browser Game Without a Budget
A no-budget release plan built around a clear game page, short clips, community outreach, portal updates, and useful post-launch notes.
Accessibility Checks for Small HTML5 Games
Low-cost improvements for keyboard access, readable text, color contrast, reduced motion, audio cues, and remappable controls.
A Pre-Submission Playtest for HTML5 Games
A focused playtest for onboarding, controls, failure states, restart flow, mobile input, saves, and the first ten minutes of play.
Why HTML5 Game Submissions Fail Review
A pre-submission review of asset rights, advertising conflicts, loading failures, controls, and mobile behavior.
Hosted ZIP or External URL: Choosing a Submission Format
Compare portal-hosted ZIP builds with developer-hosted URLs across updates, uptime, caching, security headers, and support work.
Optimizing HTML5 Game Load Time for Portal Submissions
A prioritized load-time checklist covering build size, compression, initial asset requests, fonts, audio, caching, and first interaction.
Rewarded and Interstitial Ads in HTML5 Games
Choose ad moments around player intent: optional rewards for explicit choices and interstitials only at clear breaks in play.
Where to Publish an HTML5 Game in 2026
A comparison of active HTML5 portals, their submission routes, catalog strengths, and the role PlayKovo can play in a wider release plan.
How HTML5 Game Traffic Turns Into Revenue
A practical look at playable sessions, ad opportunities, fill rate, retention, and why a catalog usually earns more reliably than one release.
Choosing an Engine for an HTML5 Portal Game
Construct, GDevelop, Godot, Phaser, and Unity WebGL compared by export size, startup time, 2D and 3D support, and workflow.