About Us
HammyTurf.io is a free online game planned, developed and operated by CMSite Inc., a company based in Osaka, Japan. This page introduces the company and the other media and games it runs.
Operating company
| Company | CMSite Inc. (株式会社ＣＭサイト) |
|---|---|
| Address | Kido Bldg. 7F, 4-6-31 Fukushima, Fukushima-ku, Osaka 553-0003, Japan |
| Founded | February 18, 2000 |
| Corporate number | 6010401044845 |
| President | Seiji Shibahara |
| Capital | 67.2 million yen |
| Business | Video advertising, media operation, e-commerce |
| Website | https://www.cmsite.co.jp/ (Japanese) |
Since launching "CM Site", Japan's first site dedicated to video advertising, in 1997, CMSite Inc. has built internet services that become part of everyday life. Today it runs the CMNetwork video ad network, a group of media sites covering news, rankings, regional information and brain training, and an e-commerce business.
About HammyTurf
- HammyTurf is an online turf war game, played as a hamster, released on August 21, 2026 as part of the company's media business.
- It is free, needs no sign-up, and runs in the browser on computers and phones. It is available in English (hammyturf.io) and Japanese (hammyturf.io/ja/), plus a LINE mini app version for Japan.
- The game is supported by advertising. See the Privacy Policy for how ads and data are handled.
- How to play is covered in the Game Guide, and updates are posted in News.
Other media and games we run
Besides HammyTurf, CMSite Inc. operates the following services. They are all in Japanese.
- Poinews (ポイニュー)
A news site where reading articles earns you points. Launched June 2017; 300,000 registered users. Japanese only. - Rankingoo! (ランキングー！)
An entertainment ranking site built on surveys of what people are curious about. Launched April 2017; 20 million monthly page views. Japanese only. - Gotouchi Johokyoku (ご当地情報局)
A guide to Japan's regional specialties, sights, local food, customs and hometown-tax gifts, shining a light on lesser-known local treasures. Launched May 2019. Japanese only. - Furusato Nozei Return-Rate Report (ふるさと納税 還元率速報)
Independent research on the return rates of Japan's hometown-tax (furusato nozei) gifts, covering over 2,000 items in 50 categories with daily updates. Launched August 2023. Japanese only. - Dr. Noutore (Dr.脳トレ)
A free brain-training web game focused on dementia prevention, about five minutes a day, with over 100 exercises supervised by a dementia specialist. Launched March 2020. Japanese only.
Contact
For feedback or bug reports about HammyTurf, please use the contact form. For business inquiries to the company (press, partnerships), please use CMSite Inc.'s contact form (Japanese).