The Campaign in Brief
In 2012, Coca-Cola Hong Kong released what is still one of the most inventive cross-screen campaigns in the category. The setup was disarmingly simple: an ad ran on TV, viewers opened the Chok! Chok! Chok! mobile app, the phone listened to the TV ad, and at the right moment the app prompted viewers to "chok" — Cantonese for shake — their phone in time with the on-screen action.
Players who shook with the right timing won prizes. Players who watched without the app missed the game. Players who told their friends about it became the campaign's distribution.
How It Worked
The mechanic was built on three then-novel layers of technology:
Around that core mechanic, the brand layered repeat plays, friend invites, time-bound bonus airings, and exclusive late-night prize windows.
Why It Worked
Cross-screen synchrony. The campaign turned a one-way TV broadcast into a two-way conversation between the screen and the viewer's phone, several years before "second screen" became a mainstream buzzword.
Embodied play. Most mobile games ask the thumb to do the work. Shaking the phone with both hands, in real time, in a living room — that's a memorable, physical, social moment. People remember campaigns they performed.
Cultural translation. "Chok" carried a specific Cantonese sense of "shake hard" that gave the campaign a name native to the audience. The brand wasn't translated into the market; it was built inside it.
Repeatability. TV ads air multiple times a day. Every airing was a fresh play session. The campaign turned media weight into game sessions one-to-one.
Results & Industry Recognition
Chok! Chok! Chok! won the Mobile Grand Prix at Cannes Lions 2012 and is widely cited in mobile and integrated-marketing case studies. Within weeks of launch the app reached the top of the Hong Kong app store, generated significant earned-media coverage in the Asia-Pacific advertising press, and demonstrated a measurable lift in Coca-Cola sales in the market.
More importantly, the campaign rewrote what was possible with a TV ad in a smartphone era. Audio watermarking and second-screen synchronisation are commonplace today. In 2012, they were a stunt — and Coca-Cola turned the stunt into a category-redefining campaign.
What Marketers Can Take Away
The specific tech is no longer the moat (every major ad-tech vendor offers audio watermarking now). The strategic moves are still very portable:
Build Your Own Cross-Screen Game
Code Crush builds cross-screen synced experiences — TV-to-mobile, retail-to-mobile, OOH-to-mobile — using QR triggers, audio watermarking, or simple time-window scheduling. We design the mechanic, ship the app or web experience, and wire the analytics so you know exactly which airing generated which lift.
@youtube[TBD|Coca-Cola Chok! Chok! Chok! — Cannes Mobile Grand Prix case film]
Already running heavy paid media? Let's make every airing playable. Talk to Code Crush about a cross-screen game built around your media plan.
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