A high school teacher watched kids spray each other with water guns outside his school.

He asked how they kept score.

"Pen and paper."

Two years later, that teacher — Josh Dunning — runs Splashin, a social game app generating over $1 million MRR with 600K+ downloads and over 2 billion views across TikTok, YouTube Shorts, and Instagram Reels.

Splashin is the purest UGC case study in this entire list. The users don't just share the content — they are the content.

The Product: Senior Assassin, Digitized

"Senior Assassin" is a game that's been played in high schools across America for decades. The rules: every student gets assigned a "target." You eliminate your target by hitting them with a water gun. Last person standing wins.

Before Splashin, students tracked everything with pen, paper, and group chats. It was chaotic, full of disputes, and impossible to manage at scale.

Splashin digitized it. The app manages targets, tracks eliminations, handles disputes, runs the brackets, and keeps score. But here's the feature that changed everything:

To officially eliminate someone, you must capture it on video or photo and post it into the app.

Read that again. Video proof is required to register an elimination.

As Social Growth Engineers reported, Splashin made viral moments a core game mechanic. Every elimination is a potential TikTok. Every game session generates dozens of clips. The content isn't marketing for the product — it is the product.

The Built-In Content Machine: 2 Billion Views

Here's what $0 in content creation costs looks like:

Splashin generates over 2 billion views across all platforms through branded accounts that repost the best user clips. According to TLDR Marketing, the content machine runs like this:

Step 1: Players film eliminations. Every game generates dozens of video clips, because filming is required. Surprise attacks, elaborate setups, dramatic moments — all captured in real-time by the players themselves.

Step 2: The best clips are reposted on Splashin's TikTok. The main account @splashin.app curates the most dramatic and unexpected elimination clips and publishes them as content. No production team needed. No scripting. No editing beyond basic cuts.

Step 3: The clips go viral on their own. Unexpected eliminations — ambushes at school, surprise attacks during hangouts, elaborate schemes to catch a target — are inherently entertaining. They follow the same psychological hooks that make prank and challenge videos go viral: tension, surprise, and dramatic resolution.

As PlayKit's analysis noted, Splashin's most popular videos don't even mention the app name. They just show the gameplay. If viewers are captivated enough, they do the work to find the app themselves. This is the opposite of traditional marketing, and it works precisely because it doesn't feel like marketing.

The Growth Loop: The Product Is the Content

Most apps have a product and a content strategy. Splashin merged them.

The game mechanic forces content creation. You literally cannot play without creating video.

Every active user is simultaneously a content creator. This is the most efficient UGC engine possible — zero acquisition cost for content.

The content drives more players. When someone sees a Splashin elimination video on TikTok, they don't see an ad. They see kids having the time of their lives. The natural response: "I want to play that." Downloads follow.

New players create new content. Every new user starts generating elimination clips immediately. The flywheel accelerates with every download.

Seasonal and school-year cycles create natural peaks. Senior Assassin games peak during spring semester and summer. Splashin's content volume and downloads spike during these periods — and the content from those peaks continues generating views year-round.

As PlayKit documented, the numbers tell the story: 114 videos on the main account, 11.6 million likes, and 5,000+ downloads per day — all without traditional advertising.

The Content Tactics That Drive Engagement

Splashin's content strategy is deceptively simple, but every element is intentional:

Film through Snapchat. Many Splashin videos use the Snapchat camera with its signature text overlay. This makes the content feel native to the Gen Z audience. It doesn't look like marketing. It looks like something your friend would send you.

Zoom into faces and use dramatic sound effects. The editing style — quick zooms, dramatic music, slow-motion replays — mirrors the meme and reaction content that Gen Z already consumes. It's entertainment formatting applied to gameplay footage.

Show elaborate elimination strategies. The most viral Splashin videos feature creative setups: faking an interview to get close to a target, ambushing someone at a restaurant, hiding in a car to surprise-attack. These are mini-narratives with clear stakes and satisfying payoffs.

Never hard-sell the app. The app name might appear briefly, but the videos focus entirely on the drama and humor of the eliminations. This is counter-intuitive to most marketers, but it's why the content works. The entertainment value drives views. The curiosity drives downloads.

From $250K to $1M MRR: The Compound Effect

Splashin's revenue growth reflects the compound nature of their content flywheel:

The app launched in July 2023 but didn't start posting on TikTok until April 2024 — nearly a year later. That early period was spent building the product and letting the game spread organically through schools.

Once TikTok posting started, the growth accelerated rapidly. From the initial $250K MRR milestone (at around 5,000 daily downloads), the app scaled to $1M MRR with 600K+ total downloads.

The key: every piece of content has compounding value. A viral elimination video posted in April continues generating views in October. The content library grows with every game session, creating an ever-expanding organic acquisition channel.

The Playbook — What You Can Steal

1. Make content creation a core product mechanic. Splashin's most radical innovation isn't the game itself — it's requiring video proof for eliminations. This single design decision turned every user into a content creator.

2. Build for a pre-existing behavior. Senior Assassin was already viral. Students were already filming these moments. Splashin didn't create demand — it created infrastructure for demand that already existed.

3. Curate user content instead of creating brand content. Splashin's TikTok team doesn't create videos. They select the best user-submitted clips and repost them.

4. Don't mention the product in the content. The videos sell the experience, not the app. Curious viewers search for the app themselves.

5. Design for seasonal peaks. Splashin's content and downloads spike during specific school calendar periods.

The Numbers That Matter

The Lesson

Josh Dunning didn't build a marketing strategy. He built a game where marketing is what happens when you play.

That's the ultimate UGC insight: the best content strategy is a product that can't be used without creating content.

Every photo. Every video. Every elimination. It's all marketing that users create willingly, eagerly, and for free.

You don't need a content calendar when your product is the content.

Find a behavior people already do. Build a tool that digitizes it. Make the tool require content. Curate the best of it. Let the platform do the rest.

That's how a high school teacher built a million-dollar-a-month business from watching kids play with water guns.

Sources:
Social Growth Engineers (https://www.socialgrowthengineers.com/1m-mrr-600k-downloads-this-app-is-making-a-huge-splash),
PlayKit Newsletter (https://playkit.beehiiv.com/p/114-videos-116m-likes-250k-mrr),
TLDR Marketing (https://tldr.tech/marketing/2025-05-23),
Splashin TikTok (https://www.tiktok.com/@splashin.app)