Minimum Publishable Playable Demo: The 9 Assets to Ship a Playable Demo That Converts in 48 Hours

The MPPD is a compact, browser-playable experience plus nine production-ready assets that together let you validate demand, capture intent, and iterate. The goal is not to ship a full product — it’s to build the smallest playable slice users can try and that gives you reliable telemetry and conversion signals. Ship in 48 hours means strict scope: a 3–7 minute microdemo loop, three social GIFs/WebM, minimal metadata, one short CTA flow, and basic acceptance tests.

Shipping quickly means trade-offs: prioritize metrics you can act on (session starts, micro-checkout attempts, onboarding completions) and skip feature completeness. Keep the build small (HTML5/WebGL or a single-page WebAssembly bundle) and host it in a place where a visitor can click play immediately. Guides for packaging browser-playable builds and uploading them to a lightweight host are widely available (for example itch.io’s HTML5 publishing guide).

Bullets:

- Outcome-focused: learn whether users take the next step (signup, checkout, or onboarding). - Constraint: everything must be buildable, linkable, and measurable in 48 hours. - Hostable as a single ZIP or static bundle to an embed/embed page for instant play.

Here is the checklist you can follow top-to-bottom. Build every item so the demo is discoverable, consumable, and measurable:

1) Playable build (HTML5 bundle or single-page WebAssembly) — a focused vertical slice that demonstrates core value in under five minutes. Use an HTML5 export or a single index.html entry so testers can play in-browser immediately. itch.io’s HTML5 guidance is a practical reference for packaging browser-playable builds.

2) Three short GIFs/WebM (15–45s) — visual micro-demos for the landing page, social sharing, and embedded previews. Prefer WebM for smaller size and better quality while keeping a GIF fallback for channels that need it. Cloudinary documentation explains converting and delivering animated images as efficient WebM/MP4 alternatives.

3) ImageObject JSON‑LD snippet — structured metadata for the demo preview image so search engines/indexers better represent your playable. Use schema.org/ImageObject fields (contentUrl, caption, width/height) embedded in JSON‑LD on the demo page to improve indexing and share preview fidelity.

4) Microdemo script (30–60 seconds) — a focused narration or caption sequence that orients the player in 30–60 seconds and highlights the outcome, not the features. Keep it as inline text overlay and a transcript to improve accessibility and A/B test copy quickly. 5) Demo telemetry hooks — pre-defined events you send when a player starts, reaches the key moment, opens the microcheckout, or exits. Use a lightweight analytics hub (Segment-style Track/Page calls) and name events consistently so you can route the same signals to analytics, session replay, and email tools. Twilio Segment’s Track spec is a good example of minimal, portable event structure.

6) Microcheckout hook — a friction-light way to capture commitment: email + $1/0 trial token, or a lightweight Stripe Checkout redirect for paid trials. Stripe’s Checkout quickstart shows how to add a hosted checkout button quickly so you don’t build payment flows from scratch.

7) Landing CTA — a single, outcome-aligned call-to-action on the page and social links. Keep the CTA copy aligned with the demo outcome (e.g., “Try 3-minute demo — start free trial”), and point it to the microcheckout or signup flow. HubSpot and conversion playbooks recommend single, prominent CTAs that match the landing headline for higher conversion.

8) Onboarding snippet — a 2–3 step inline onboarding that runs after the microcheckout/success state and records the first activation event. Keep this to the minimum to remove friction but capture the user’s first success. 9) Acceptance tests — a few automated checks (play starts, reach end state, telemetry fired, checkout redirect) implemented in a lightweight E2E test (for example Cypress) so you can validate the demo after each small change and before publishing. Cypress docs provide approachable first-test examples and test types suited for acceptance checks.

Hour 0–4: scope and create the tiny vertical slice. Define the single core outcome the demo must show in under five minutes. Export an HTML5 or single-file WebAssembly bundle (index.html + assets) that runs locally and in an iframe host. Itch.io’s quick guides to uploading HTML5 archives let you validate the hosting and embedding step quickly.

Hour 4–12: visuals and microdemo assets. Record 3 short clips (hero loop, one close-up of the core interaction, one ending CTA) and export as WebM; produce a GIF fallback if needed. Add an ImageObject JSON‑LD block to the demo page including contentUrl and caption so the preview is discoverable by indexers.

Hour 12–24: telemetry, microcheckout, and landing page. Add Segment-style Track/Page hooks for start, key moment, checkout attempt, and onboarding complete. Wire a microcheckout using Stripe Checkout or an email capture flow that exchanges an email for an instant token. Use a single landing CTA that maps directly to the checkout or to the embedded demo play state.

Hour 24–36: onboarding snippet and copy polish. Build the 2-step onboarding snippet shown after checkout or signup; record OnboardComplete as a tracked event. Polish copy for headline → hero → CTA alignment — HubSpot and landing studies show conversion benefit from tightly matched messaging and a single outcome-focused CTA. Hour 36–48: acceptance tests and launch. Implement 3–6 Cypress acceptance checks (page loads, play start, telemetry fired, checkout redirect). Run manual sanity checks in private browsing and publish to your host or itch.io. Announce with the three GIFs/WebM and a single landing CTA that points to the playable and microcheckout.

Convertible signals to watch in the first 72 hours: play starts per visitor, percent reaching KeyMoment, microcheckout opens vs completions, onboarding completion rate. Route these events to your analytics and to a lightweight email drip: a non-completing player who opened checkout but didn’t finish is a high-intent lead worth a personal follow-up or an automated recovery email.

Next moves after a validated signal: if trials convert (checkout completions + onboarding complete), prioritize polishing the onboarding and adding payment options. If play starts are high but KeyMoment completion is low, shorten the demo loop or surface the core value earlier. Acceptance tests (Cypress) will protect your fast iterations so you can adjust the playable without breaking the measurement pipeline.

Bullets:

- Track: PlayStarted, ReachedKeyMoment, CheckoutOpened, CheckoutCompleted, OnboardComplete. - If CheckoutOpened >> CheckoutCompleted: test microcheckout flow and messaging. - If PlayStarted >> ReachedKeyMoment: compress demo loop and add an overlay to guide users to the value moment.