Toss and Neptune to Host ‘HTML5 Game Challenge’

• Open call for creative HTML5 games … applications open from August 25 to November 3
• Open to individuals and team studios … total prize money of ₩70M

Viva Republica, the operator of the financial super app “Toss,” announced that it will jointly host the ‘Toss HTML5 Game Challenge with Neptune’ with mobile game company Neptune on July 30.

The contest has been organized to discover and support creative game content. Neptune, the co-organizer, is a mobile game company known for titles such as Stairway to Heaven and Cat Snack Bar, and has developed various casual games based on creativity and mass appeal.

The contest is open to creative games developed on an HTML5 basis. Submissions can range freely from hyper-casual games to RPG genres, except for board games such as Go-Stop or Omok. Anyone can participate, from individual developers to small team-based studios, and there are no restrictions on the number of submissions or participation attempts.

Applications will be accepted from August 25 to November 3, 2025. Developers can submit their game builds through the official console on the Apps in Toss website. Entries must be original works that do not infringe on third-party intellectual property rights, and all IP rights must belong to the participants. After submission, a game age rating must be obtained in order for the game to go live.

After the application period ends, judging will take place for about three weeks starting November 24, with the final winners to be announced afterward. A total of ₩70M will be awarded: ₩30M for first place, ₩20M for second place, ₩10M for third place, and ₩2M each for five runner-up teams.

In addition, non-commercial games that have not signed or pursued a publishing contract will be considered as candidates for IP publishing deals with Neptune.

The contest has been planned to expand the game partner ecosystem of ‘Apps in Toss,’ which is Toss’ in-app service platform. Apps in Toss allows external partners’ web and app services to run within the Toss app, providing opportunities to open its services to Toss’ 29 million subscribers.

“HTML5 games can be played instantly without installation, offering high accessibility and unique enjoyment for users,” a Toss representative said. “Through this challenge, we will actively support domestic developers so that their creative games can meet users via Apps in Toss.”